Knitted multi-layer hollow heteromorphic cylindrical structure stab-resistant fabric and method for manufacturing the same

Abstract

The application relates to a knitted multilayer hollow heterogeneous cylindrical structure stab-resistant fabric and a preparation method thereof, and relates to the field of protective textile materials. In one aspect, the knitted multilayer hollow heterogeneous cylindrical structure stab-resistant fabric is integrally knitted into a cylindrical shape by means of a four-needle-bar computerized flat knitting machine. Since there is no side seam, the knitted multilayer hollow heterogeneous cylindrical structure stab-resistant fabric avoids subsequent sewing, has a simple preparation process, reduces the difficulty of garment making, and greatly improves the production efficiency. The fabric has the properties of softness, flexibility and processability, and can be applied to protective vests, protective sleeves and other equipment. In another aspect, the knitted multilayer hollow heterogeneous cylindrical structure stab-resistant fabric is composed of a plurality of stab-resistant hollow structure units, and can be elastically assembled into a single-layer or double-layer stab-resistant block according to actual conditions. The double-layer stab-resistant block can be overlapped up and down and left and right, and can effectively resist threats such as stab wounds and cuts.

Description

Technical Field

[0001] This application relates to the field of protective textile materials technology, and in particular to a knitted multilayer hollow heterogeneous tubular structure stab-resistant fabric and its preparation method. Background Technology

[0002] In their daily work, workers in high-risk industries, scientific and technological workers, and doctors all require protective equipment with puncture resistance to ensure their safety. Therefore, developing puncture-resistant clothing that is both highly protective and flexible and lightweight is of great significance.

[0003] Currently, stab-resistant fabrics on the market are generally classified into three types: rigid, semi-rigid, and soft. Rigid stab-resistant vests are typically made by overlapping metal plates and rigid composite materials as stab-resistant plates. These vests are heavy and lack flexibility, severely reducing the wearer's comfort. Soft stab-resistant vests are mostly made by laminating fabrics of high-performance fibers such as aramid fibers and ultra-high molecular weight polyethylene, but these vests are expensive and bulky.

[0004] For example, patent CN108859319A discloses a puncture-resistant composite fabric structure that is soft, lightweight, and highly puncture-resistant. This structure consists of four parts: a skin-friendly layer, an abrasion-resistant surface layer, a steel wire braided layer, and a puncture-resistant layer. The puncture-resistant layer is composed of multiple evenly distributed rigid protective blocks, which are connected and attached to the steel wire braided layer by high-strength metal fibers or rivets to form the puncture-resistant composite fabric structure. While this structure improves flexibility to some extent, the steel wire braiding method increases the difficulty of weaving and the discomfort of the garment. Patent CN220639171U discloses a protective fabric composed of a flexible fabric and multiple hexagonal rigid resin blocks. The rigid resin blocks are bonded to the flexible fabric, existing independently but in contact with each other. This method requires adhesive, which presents a problem with the bonding strength. Furthermore, once bonded, they are essentially irremovable, which is a drawback for some professions where these are used as everyday work clothes.

[0005] However, while the aforementioned technologies improve the protective performance of materials, these methods inevitably involve very complex, tedious, and lengthy processes to bond the rigid protective material to the base fabric to achieve the protective effect, which severely limits production efficiency. Furthermore, resin bonding, coating, and impregnation methods also limit the number of uses and lifespan of protective clothing; once damaged, it will lose its protective function. Therefore, we propose a knitted multilayer hollow heterogeneous tubular stab-resistant fabric and its preparation method. This not only achieves the fabric's protective performance and durability and improves the wearer's flexibility and comfort, but also shortens the production process and reduces the difficulty of garment manufacturing. Summary of the Invention

[0006] The purpose of this application is to provide a knitted multilayer hollow heterogeneous tubular stab-resistant fabric and its preparation method, so as to solve the problems existing in the prior art.

[0007] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0008] In a first aspect, this application provides a knitted multilayer hollow heterogeneous tubular structure stab-resistant fabric, wherein the knitted multilayer hollow heterogeneous tubular structure stab-resistant fabric is a three-dimensional tubular structure formed by connecting the front and back pieces of fabric.

[0009] The knitted multilayer hollow heterogeneous tubular structure stab-resistant fabric includes:

[0010] The product comprises a wear-resistant outer layer, a skin-friendly inner layer, and several three-sided connected, one-sided open pouch-shaped hollow interlayers formed by a needle-turning action between the wear-resistant outer layer and the skin-friendly inner layer. Anti-puncture blocks are replaceably provided inside the pouch-shaped hollow interlayers.

[0011] Secondly, this application provides a knitted multilayer hollow heterogeneous tubular structure stab-resistant fabric, wherein the knitted multilayer hollow heterogeneous tubular structure stab-resistant fabric is a three-dimensional tubular structure formed by connecting the front and back pieces of fabric.

[0012] The knitted multilayer hollow heterogeneous tubular structure stab-resistant fabric includes:

[0013] The abrasion-resistant outer layer, the skin-friendly inner layer, and the spacer layer between the abrasion-resistant outer layer and the skin-friendly inner layer; several three-sided connected, one-sided open pocket-shaped hollow interlayers are formed between the abrasion-resistant outer layer and the spacer layer, and between the skin-friendly inner layer and the spacer layer, through a needle-turning action, and anti-puncture blocks are replaceably provided in the pocket-shaped hollow interlayers.

[0014] Thirdly, this application provides a method for preparing a knitted multilayer hollow heterogeneous tubular structure stab-resistant fabric. The method is used to prepare the knitted multilayer hollow heterogeneous tubular structure stab-resistant fabric provided in the first aspect. The method employs a four-needle bed computerized flat knitting machine for knitting. The method includes:

[0015] S1. Cast-on knitting: Knit full stitches on the back knit and front knit needle beds in sequence to complete the knitting of the 1st and 2nd rows; turn the loops 1 every other stitch on the back knit needle bed to the front purl needle bed, knit 1 every other stitch on the back knit needle bed, then turn the loops of the front purl needle bed back to complete the back piece of the tubular fabric, i.e., the knitting of the 3rd row; turn the loops 1 every other stitch on the front knit needle bed to the back purl needle bed, knit 1 every other stitch on the front knit needle bed, then turn the loops of the back purl needle bed back to complete the front piece of the tubular fabric, i.e., the knitting of the 4th row; repeat the 3rd and 4th rows a times to complete the cast-on knitting;

[0016] S2, Main Body Knitting: The loops of the front lower and back lower needle beds are selectively turned to the back upper and front upper auxiliary needle beds, respectively, to control the loop formation and complete the multi-layer structure knitting. At the position where the abrasion-resistant outer layer and the skin-friendly inner layer intersect, the front abrasion-resistant outer layer is selectively left unstitched, while the front skin-friendly inner layer is formed by floating yarn, so that the loops of the abrasion-resistant outer layer are turned to the skin-friendly inner layer, creating a cross-linking effect between the abrasion-resistant outer layer and the skin-friendly inner layer. By cycling the longitudinal row of the puncture-resistant hollow structure unit 2m times, the number of bag-shaped hollow layers in a cylindrical transverse row is controlled, and the width of the knitted multi-layer heterogeneous cylindrical puncture-resistant fabric is determined. Cycling the cylindrical transverse row n times yields the height of the puncture-resistant hollow structure unit. At this point, the bag-shaped hollow layer is double-opened, and one side of the bag-shaped hollow layer is closed to complete the knitting of the 2+2a+2n transverse row, thus ending the main body knitting.

[0017] S3. Finishing Knitting: Perform full stitch knitting on the back bottom and front bottom needle beds in sequence, repeating a times; Insert anti-stab blocks detachably into the pocket-shaped hollow interlayer to resist stabs and cuts. The anti-stab blocks are constrained by the fabric and are arranged in an array of overlapping and interlaced shapes.

[0018] Fourthly, this application provides a method for preparing a knitted multilayer hollow heterogeneous tubular structure stab-resistant fabric. The method is used to prepare the knitted multilayer hollow heterogeneous tubular structure stab-resistant fabric provided in the second aspect. The method employs a four-needle bed computerized flat knitting machine for knitting. The method includes:

[0019] S1. Cast-on knitting: Knit full stitches on the back knit and front knit needle beds in sequence to complete the knitting of the 1st and 2nd rows; turn the loops 1 every other stitch on the back knit needle bed to the front purl needle bed, knit 1 every other stitch on the back knit needle bed, then turn the loops of the front purl needle bed back to complete the back piece of the tubular fabric, i.e., the knitting of the 3rd row; turn the loops 1 every other stitch on the front knit needle bed to the back purl needle bed, knit 1 every other stitch on the front knit needle bed, then turn the loops of the back purl needle bed back to complete the front piece of the tubular fabric, i.e., the knitting of the 4th row; repeat the 3rd and 4th rows a times to complete the cast-on knitting;

[0020] S2. Main Body Knitting: The loops of the front and back bottom needle beds are flipped to the back and front top auxiliary needle beds respectively, controlling the loop formation to complete the multi-layer structure knitting. At the position where the left and right sides of the bag-shaped hollow interlayer formed by the abrasion-resistant outer layer and the spacer layer intersect, the loops of the abrasion-resistant outer layer are flipped to the spacer layer, and the loops of the spacer layer are flipped to the abrasion-resistant outer layer. At the position where the left and right sides of the bag-shaped hollow interlayer formed by the spacer layer and the skin-friendly inner layer intersect, the loops of the spacer layer are flipped to the skin-friendly inner layer, and the loops of the skin-friendly inner layer are flipped to the spacer layer. This process is repeated 2m times in the longitudinal row of the puncture-resistant hollow structure unit to control the number of bag-shaped hollow interlayers in a tubular horizontal row, determine the width of the knitted multi-layer heterogeneous tubular structure puncture-resistant fabric, and obtain a complete tubular horizontal row. By repeating the tubular horizontal row n times, the height of the puncture-resistant hollow structure unit can be obtained. At this time, the bag-shaped hollow interlayer is double-opened, and one side of the bag-shaped hollow interlayer is closed to complete the knitting of the 2+2a+2n horizontal row, that is, the main body knitting is completed.

[0021] S3. Finishing Knitting: Perform full stitch knitting on the back bottom and front bottom needle beds in sequence, repeating a times; Insert anti-stab blocks detachably into the pocket-shaped hollow interlayer to resist stabs and cuts. The anti-stab blocks are constrained by the fabric and are arranged in an array of overlapping and interlaced shapes.

[0022] Fifthly, this application provides a stab-proof garment made from the knitted multilayer hollow heterogeneous tubular structure stab-proof fabric as described above.

[0023] The beneficial effects of the technical solution provided in this application include at least the following:

[0024] 1. The knitted multi-layer hollow heterogeneous tubular structure stab-proof fabric provided in this application can be knitted into a tubular shape in one piece using only a four-needle bed computer flat knitting machine. Since there is no side seam, the subsequent sewing is avoided, the preparation process is simple, the difficulty of garment making is reduced, and the production efficiency is greatly improved. The fabric has the properties of softness, flexibility and processability, and can be used in protective vests, protective sleeves and other equipment.

[0025] 2. The knitted multi-layer hollow heterogeneous tubular structure stab-proof fabric provided in this application is composed of multiple stab-proof hollow structural units. It can be elastically assembled into single or double-layer stab-proof blocks according to actual conditions. Since the unit hollow protective structure fabric is woven with elastic yarn and connected by left and right seams, the double-layer stab-proof blocks can also be overlapped vertically and connected by left and right seams, which can effectively resist threats such as stabs and cuts.

[0026] 3. The bag-shaped hollow interlayer of the knitted multi-layer hollow heterogeneous tubular stab-resistant fabric provided in this application can be filled with and inserted hard stab-resistant blocks such as resin, alloy, and metal plates. The stab-resistant blocks are not completely fixed. Without damaging the main fabric, a damaged stab-resistant block can be disassembled and replaced, which greatly improves the service life of the fabric. Attached Figure Description

[0027] The accompanying drawings are provided to further illustrate the present application and form part of the specification. They are used together with the embodiments of the present application to explain the application and do not constitute a limitation thereof. In the drawings:

[0028] Figure 1 A schematic diagram of the simulated structure of the knitted multilayer hollow heterogeneous tubular stab-resistant fabric provided in Embodiment 1 of this application is shown.

[0029] Figure 2 This shows a side view of the coil structure of the knitted multilayer hollow heterogeneous tubular stab-resistant fabric provided in Embodiment 1 of this application;

[0030] Figure 3 The diagram shows a process diagram of the preparation method of the knitted multilayer hollow heterogeneous tubular stab-resistant fabric provided in Embodiment 1 of this application; Figure 3 (a) is a diagram of the weaving process for the base layer. Figure 3 (b) is the minimum cycle for the puncture-resistant hollow structural unit. Figure 3 (c) is a weaving process diagram of the connection point of the puncture-resistant hollow structural unit. Figure 3 (d) is a diagram of the weaving process at the end;

[0031] Figure 4 This paper shows a simulated structural diagram of the stab-resistant fabric with a multi-layered hollow heterogeneous tubular structure provided in Embodiment 2 of this application;

[0032] Figure 5 This shows a side view of the coil structure of the knitted multilayer hollow heterogeneous tubular stab-resistant fabric provided in Embodiment 2 of this application;

[0033] Figure 6 The diagram shows a process diagram of the preparation method of the knitted multilayer hollow heterogeneous tubular stab-resistant fabric provided in Embodiment 2 of this application; Figure 6 (a) is a diagram of the weaving process for the base layer. Figure 6 (b) represents the minimum cycle of the first stab-resistant hollow structural unit. Figure 6 (c) is a weaving process diagram of the connection point of the puncture-resistant hollow structural unit. Figure 6 (d) represents the minimum cycle of the second stab-resistant hollow structural unit. Figure 6 (e) is a diagram of the weaving process at the end;

[0034] Figure 7The flowchart and physical image of the knitted multilayer hollow heterogeneous tubular stab-resistant fabric provided in Embodiment 2 of this application are shown. Figure 7 (a) is a flowchart. Figure 7 (b) shows actual photos of the five fabrics. Figure 7 (c) is a photograph of a knitted multilayer hollow heterogeneous tubular stab-resistant fabric containing rigid stab-resistant blocks.

[0035] Figure 8 The data test diagram of the knitted multilayer hollow heterogeneous tubular stab-resistant fabric provided in Embodiment 2 of this application is shown; Figure 8 (a) is a graph showing the 24J puncture energy and dynamic puncture displacement-force curve. Figure 8 (b) is a diagram showing the double-layer protection coverage of five types of knitted multilayer hollow heterogeneous tubular stab-resistant fabrics containing rigid stab-resistant blocks. Figure 8 (c) is a diagram showing the flexibility (bending stiffness) of a knitted multilayer hollow heterogeneous tubular stab-resistant fabric containing rigid stab-resistant blocks. Figure 8 (d) is a puncture damage morphology of the abrasion-resistant surface layer of a knitted multilayer hollow heterogeneous tubular puncture-resistant fabric containing hard puncture blocks under dynamic puncture action with 24J puncture energy. Figure 8 (e) is a surface puncture damage morphology diagram of the first hollow structural unit of a knitted multilayer hollow heterogeneous tubular puncture-resistant fabric containing a hard puncture-resistant block under 24J puncture energy and dynamic puncture action. Figure 8 (f) is a back puncture damage morphology diagram of the first hollow structural unit of a knitted multilayer hollow heterogeneous tubular puncture-resistant fabric containing a hard puncture-resistant block under 24J puncture energy and dynamic puncture action. Detailed Implementation

[0036] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0037] In this specification, identical components are represented by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "upper," and "lower" used in the following description refer to directions in the accompanying drawings, while the terms "bottom surface," "top surface," "inner," and "outer" refer to directions towards or away from a specific component, respectively. Furthermore, 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 indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this specification, "multiple" means two or more.

[0038] First, let's explain the terms that appear in the examples:

[0039] Puncture-resistant hollow structural unit:

[0040] A stab-resistant hollow structural unit refers to a basic unit structure of a multi-layered, hollow, heterogeneous tubular stab-resistant fabric. It includes an abrasion-resistant outer layer and a skin-friendly inner layer (corresponding to a double layer), or an abrasion-resistant outer layer, a skin-friendly inner layer, and a spacer layer (corresponding to a triple layer), or it can be described as consisting of a bag-like hollow interlayer. Stab-resistant blocks can be inserted into the stab-resistant hollow structural unit to meet the high protection requirements of clothing.

[0041] The present application will be further described below with reference to the accompanying drawings and embodiments.

[0042] Example 1: (Double Layer)

[0043] Figure 1 This illustration shows a simulated structural diagram of the knitted multilayer hollow heterogeneous tubular stab-resistant fabric provided in Embodiment 1 of this application. Figure 2 This illustration shows a side view of the loop structure of a knitted multilayer hollow heterogeneous tubular stab-resistant fabric provided in Embodiment 1 of this application. This knitted multilayer hollow heterogeneous tubular stab-resistant fabric is manufactured using a four-needle bed computerized flat knitting machine. The fabric is constructed from two layers of tubular knitted base fabric, or it can be considered as being constructed from four layers of knitted fabric. The fabric is a three-dimensional tubular structure formed by connecting the front and back pieces of fabric. This stab-resistant fabric forms a three-dimensional tubular structure based on a two-dimensional knitting method. Therefore, the three-dimensional tubular fabric can be converted into a front and back piece of fabric connected only at the sides. Since there is no connection between the front and back pieces, a tubular structure with an air layer effect is formed within the fabric.

[0044] In detail, the knitted multi-layer hollow heterogeneous tubular structure stab-resistant fabric includes: an abrasion-resistant outer layer 1, a skin-friendly inner layer 2, and several three-sided connected, one-sided open pocket-shaped hollow interlayers 3 formed by a turning needle action between the abrasion-resistant outer layer 1 and the skin-friendly inner layer 2. The several pocket-shaped hollow interlayers 3 are arranged in an array to form the skeleton of the fabric. Since it is woven in one go by the turning needle technology and the spaced needle knitting method of the machine, stab-resistant blocks can be replaced in the pocket-shaped hollow interlayers 3. The stab-resistant blocks are hard stab-resistant blocks, which include at least one of resin, alloy, and metal armor plates to achieve the stab-resistant effect of the fabric.

[0045] Figure 3 The diagram illustrates a process for preparing the knitted multilayer hollow heterogeneous tubular stab-resistant fabric according to Embodiment 1 of this application. Figure 3 (a) is a diagram of the weaving process for the base layer. Figure 3 (b) is the minimum cycle for the puncture-resistant hollow structural unit. Figure 3 (c) is a weaving process diagram of the connection point of the puncture-resistant hollow structural unit. Figure 3 (d) shows the weaving process diagram for the finishing section. A Shima Seiki four-needle bed computerized flat knitting machine is used to weave the skeleton of the stab-resistant fabric. 400D ultra-high molecular weight polyethylene (UHMWPE) is used to develop a multi-layered hollow heterogeneous tubular structure stab-resistant fabric. The method described in this embodiment is not limited to the described chemical fiber yarns and UHMWPE filaments. Technicians can change the type of yarn according to requirements, such as choosing comfortable and friendly fibers for the skin-friendly inner layer and high-strength, high-modulus yarns for the abrasion-resistant outer layer, to meet actual production needs.

[0046] The method includes:

[0047] S1. Cast on: Knit full stitches on the back knit and front knit needle beds to complete the first and second rows; turn the loops from the back knit needle bed 1 every other stitch to the front purl needle bed, knit 1 every other stitch on the back knit needle bed 1, then turn the loops from the front purl needle bed back to complete the back piece of the tubular fabric, i.e., the third row; turn the loops from the front knit needle bed 1 every other stitch to the back purl needle bed, knit 1 every other stitch on the front knit needle bed 1, then turn the loops from the back purl needle bed back to complete the front piece of the tubular fabric, i.e., the fourth row; repeat the third and fourth rows a times to complete the cast on.

[0048] S2. Main Body Knitting: The loops of the front lower and back lower needle beds are selectively turned to the back upper and front upper auxiliary needle beds to control the loop formation, thus completing the multi-layer structure knitting. At the position where the abrasion-resistant outer layer and the skin-friendly inner layer intersect, the front abrasion-resistant outer layer is selectively left un-turned, while the front skin-friendly inner layer is formed by floating yarn, so that the loops of the abrasion-resistant outer layer are turned to the skin-friendly inner layer, creating a cross-linking effect between the abrasion-resistant outer layer and the skin-friendly inner layer. By cycling the longitudinal row of the puncture-resistant hollow structure unit 2m times, the number of bag-shaped hollow layers in a cylindrical transverse row is controlled, determining the width of the knitted multi-layer heterogeneous cylindrical puncture-resistant fabric. Cycling the cylindrical transverse row n times yields the height of the puncture-resistant hollow structure unit. At this point, the bag-shaped hollow layer is double-opened, and one side of the bag-shaped hollow layer is closed to complete the knitting of the 2+2a+2n transverse row, thus ending the main body knitting.

[0049] S3. Finishing Knitting: Perform full stitch knitting on the back and front needle beds in sequence, repeating a times; Insert detachable anti-stab blocks into the pocket-shaped hollow interlayer to prevent stabs and cuts. The anti-stab blocks are constrained by the fabric and are arranged in an array of overlapping and interlaced shapes.

[0050] In this embodiment, the anti-stab block inside the bag-shaped hollow interlayer 3 is a carbon fiber rigid resin plate. Its knitted loops tightly wrap around the anti-stab block, thereby preventing the anti-stab block from sliding or falling off. At the same time, the anti-stab block is not fixed and can be disassembled and replaced if damaged. It is very suitable for some jobs where there is a risk of punctures in daily life. In addition, it is molded in one piece, which simplifies the subsequent processes, improves production efficiency, and also has the properties of being soft, flexible, and easy to process.

[0051] Example 2: (Three layers)

[0052] Figure 4 This paper shows a simulated structural diagram of the stab-resistant fabric with a multi-layered hollow heterogeneous tubular structure provided in Embodiment 2 of this application; Figure 5 This illustration shows a side view of the loop structure of the knitted multilayer hollow heterogeneous tubular stab-resistant fabric provided in Embodiment 2 of this application. This knitted multilayer hollow heterogeneous tubular stab-resistant fabric is manufactured using a four-needle bed computerized flat knitting machine. The fabric is constructed from three layers of double-hollow tubular knitted base fabric, or it can be considered as a six-layer knitted fabric. The fabric is a three-dimensional tubular structure formed by connecting the front and back pieces. This stab-resistant fabric forms a three-dimensional tubular structure based on a two-dimensional knitting method. Therefore, the three-dimensional tubular fabric can be converted into a front and back piece connected only at the sides. Since there is no connection between the front and back pieces, a tubular structure with an air layer effect is formed within the fabric.

[0053] In detail, the knitted multi-layer hollow heterogeneous tubular stab-resistant fabric includes: an abrasion-resistant outer layer 1, a skin-friendly inner layer 2, and a spacer layer 4 located between the abrasion-resistant outer layer 1 and the skin-friendly inner layer 2. Several three-sided connected, one-sided open pocket-shaped hollow interlayers 3 are formed between the abrasion-resistant outer layer 1 and the spacer layer 4, and between the skin-friendly inner layer 2 and the spacer layer 4, through a turning needle action. These pocket-shaped hollow interlayers 3 overlap to form the fabric's skeleton. Because it is knitted in one piece using machine turning needle technology and spaced needle knitting, stab-resistant blocks can be replaceably installed inside the pocket-shaped hollow interlayers 3. These stab-resistant blocks are hard stab-resistant blocks, and the hard stab-resistant blocks include at least one of resin, alloy, and metal armor plates to achieve the fabric's stab-resistant effect. Compared to Embodiment 1, the fabric structure of this embodiment can extend the height of the pocket-shaped hollow interlayers 3 and allow the pocket-shaped hollow interlayers 3 to overlap, improving protective safety and the fabric's flexibility.

[0054] Figure 6 The diagram illustrates the process of preparing the knitted multi-layer hollow heterogeneous tubular stab-resistant fabric according to Embodiment 2 of this application. The fabric is prepared using 600D ultra-high molecular weight polyethylene yarn and two nylon-spandex covered yarns on a Shima Seiki four-needle bed fully-furnished computerized flat knitting machine. Technicians can modify the yarn type according to requirements, such as choosing comfortable and skin-friendly fibers for the inner skin layer and high-strength, high-modulus yarns for the abrasion-resistant outer layer, to meet actual production needs.

[0055] The method includes:

[0056] S1, base weave: such as Figure 6 As shown in (a), perform full stitch knitting on the back knit and front knit needle beds in sequence to complete the knitting of the 1st and 2nd rows; turn the loop 1 on the back knit needle bed to the front upper needle bed every other stitch, knit every other stitch on the back knit needle bed 1, and then turn the loop on the front upper needle bed back to complete the back piece of the tubular fabric, i.e., the knitting of the 3rd row; turn the loop 1 on the front knit needle bed to the back upper needle bed every other stitch, knit every other stitch on the front knit needle bed 1, and then turn the loop on the back upper needle bed back to complete the front piece of the tubular fabric, i.e., the knitting of the 4th row; complete the cast-on knitting by repeating the 3rd and 4th rows a times.

[0057] S2, Body weaving: such as Figure 6As shown in (b), when knitting the first puncture-resistant hollow structural unit, during knitting, a portion of the loops from the back knitting bed 1 at interval 1 are flipped onto the empty needles of the front upper knitting bed. At this time, a new row of loops is started on the empty needles of the back knitting bed. Then, the portion of loops that were flipped onto the empty needles of the front upper knitting bed are flipped back onto the back knitting bed. The loops located at needle position j of the back knitting bed are not flipped, thus forming the 5th horizontal row, which is the wear-resistant surface layer of the back piece. The portion of loops from the back knitting bed 1 at interval 1 are flipped onto the empty needles of the back upper knitting bed. At this time, a new row of loops is started on the empty needles of the front knitting bed. Then, flip the portion of the loops that were previously flipped onto the empty needles of the back upper needle bed back onto the front lower needle bed, while the loops at the k needle position on the back lower needle bed are not flipped. This process forms the 6th row, which is the abrasion-resistant surface layer of the front piece. The loops at the 3-slot interval of the back lower needle bed 1 and the loops at the k needle position are flipped onto the empty needles of the front upper needle bed. At this point, a new row of loops is started on the empty needles of the back lower needle bed. Then, the portion of the loops that were previously flipped onto the empty needles of the front upper needle bed are flipped back onto the back lower needle bed, forming the 7th row, which is the spacer layer of the back piece. The loops at the 3-slot interval of the front lower needle bed 1 and the loops at the j needle position are flipped... Turn the loops from the back upper needle bed onto the empty needles. Begin knitting a new row of loops on the empty needles of the front lower needle bed. Then, flip the loops that were previously flipped onto the back upper needle bed back onto the front lower needle bed, thus forming the 8th row, which is the spacer layer of the front piece. Flip the loops from the back lower needle bed at position r onto the empty needles of the front upper needle bed. Begin knitting a new row of loops on the empty needles of the back lower needle bed. Then, flip the loops that were previously flipped onto the empty needles of the front upper needle bed back onto the back lower needle bed, thus forming the 9th row, which is the skin-friendly inner layer of the back piece. Flip the loops from the front lower needle bed at position s onto the empty needles of the back upper needle bed. On the needle, begin knitting a new row of loops on the empty needle of the front lower needle bed. Then, flip the loops that were previously flipped onto the empty needle of the rear upper needle bed back onto the front lower needle bed, thus knitting the 10th row, which is the skin-friendly inner layer of the front piece. Rows 5 to 10 form a row of fabric. Repeat rows 5 to 10 m times as needed to obtain the appropriate pocket-shaped hollow layer height. As can be seen from the knitting, although the loops are knitted continuously in adjacent rows, the loops are separated by the spacer loops and do not overlap. Therefore, after the machine is removed, the spacer loops on the front needle bed will form three layers. At this point, the pocket-shaped hollow layer has two openings. To facilitate the subsequent insertion of the puncture-resistant block, one side of the pocket-shaped hollow layer needs to be closed. Therefore, the three layers need to be connected, such as... Figure 6 As shown in (c), by flipping the needle and moving the needle bed, a pocket-shaped hollow interlayer is formed between the skin-friendly inner layer and the spacer layer. Therefore, the abrasion-resistant surface layer of the first puncture-resistant hollow structural unit continues to form the spacer layer of the second puncture-resistant hollow structural unit. Thus, it can be observed that the continuity of the pocket-shaped hollow interlayer allows the puncture-resistant blocks to overlap. Simultaneously, due to the different needle positions, the first and second puncture-resistant hollow structural units are staggered vertically, greatly improving the protection probability and the fabric's flexibility. Figure 6As shown in (d), the second anti-stab hollow structural unit is basically similar to the first anti-stab hollow structural unit, except for the different stitch position. By adjusting the size of the first and second anti-stab hollow structural units, the size of the inserted anti-stab block is changed, thereby changing the flexibility of the anti-stab fabric.

[0058] S3, Finishing weave: such as Figure 6 (e) shows that full stitches are knitted sequentially on the back and front needle beds, and the cycle is repeated a times; anti-stab blocks are detachably inserted into the pocket-shaped hollow interlayer to resist stabs and cuts. The anti-stab blocks are constrained by the fabric and are arranged in an array of overlapping and interlaced shapes.

[0059] In this embodiment, the anti-stab block inside the bag-shaped hollow interlayer 3 is a carbon fiber rigid resin plate. Its knitted loops tightly wrap around the anti-stab block, thereby preventing the anti-stab block from sliding or falling off. At the same time, the anti-stab block is not fixed and can be disassembled and replaced if damaged. It is very suitable for some jobs where there is a risk of punctures in daily life. In addition, it is molded in one piece, which simplifies the subsequent processes, improves production efficiency, and also has the properties of being soft, flexible, and easy to process.

[0060] Performance testing:

[0061] Figure 7 The flowchart and physical image of the knitted multilayer hollow heterogeneous tubular stab-resistant fabric provided in Embodiment 2 of this application are shown. Figure 7 (a) is a flowchart. Figure 7 (b) shows actual photos of the five fabrics. Figure 7 (c) is a photograph of a knitted multilayer hollow heterogeneous tubular stab-resistant fabric containing rigid stab-resistant blocks.

[0062] A three-layer knitted multi-layer hollow heterogeneous tubular structure stab-resistant fabric was prepared by using 600D ultra-high molecular weight polyethylene yarn and two nylon-spandex coated yarns. Five different sizes of the knitted multi-layer hollow heterogeneous tubular structure fabric with varying pocket-shaped hollow interlayers were also prepared. Figure 7 As shown in (b), the basic parameters of the five fabrics were tested, please refer to Table 1 below.

[0063] Table 1:

[0064]

[0065]

[0066] Then, a rigid puncture-resistant block is inserted into the opening of the fabric. The puncture-resistant block is 2.5mm thick and weighs 3920g / m². 2 , can obtain as Figure 7(c) shows a multi-layered hollow heterogeneous tubular stab-resistant fabric with stab-resistant blocks. After the hard stab-resistant blocks are inserted, the fabric is stretched laterally, becoming wider and thinner. A dynamic stab-resistant test was conducted on the multi-layered hollow heterogeneous tubular stab-resistant fabric with stab-resistant blocks using a 24J energy impact. The test showed that the fabric could withstand a single stab-resistant block without penetration, meeting the Class A stab-resistant standard.

[0067] Figure 8 The data test diagram of the knitted multilayer hollow heterogeneous tubular stab-resistant fabric provided in Embodiment 2 of this application is shown; Figure 8 (a) is a graph showing the 24J puncture energy and dynamic puncture displacement-force curve. Figure 8 (b) is a diagram showing the double-layer protection coverage of five types of knitted multilayer hollow heterogeneous tubular stab-resistant fabrics containing rigid stab-resistant blocks. Figure 8 (c) is a diagram showing the flexibility (bending stiffness) of a knitted multilayer hollow heterogeneous tubular stab-resistant fabric containing rigid stab-resistant blocks. Figure 8 (d) is a puncture damage morphology of the abrasion-resistant surface layer of a knitted multilayer hollow heterogeneous tubular puncture-resistant fabric containing hard puncture blocks under dynamic puncture action with 24J puncture energy. Figure 8 (e) is a surface puncture damage morphology diagram of the first hollow structural unit of a knitted multilayer hollow heterogeneous tubular puncture-resistant fabric containing a hard puncture-resistant block under 24J puncture energy and dynamic puncture action. Figure 8 (f) is a back puncture damage morphology diagram of the first hollow structural unit of a knitted multilayer hollow heterogeneous tubular puncture-resistant fabric containing a hard puncture-resistant block under 24J puncture energy and dynamic puncture action.

[0068] In addition, the double-layer protection coverage and protective flexibility of the knitted multi-layer hollow heterogeneous tubular stab-resistant fabric containing stab-resistant blocks were measured. Due to the interlacing and overlapping of the bag-shaped hollow interlayers, the overall protection probability of the fabric was 100%. Based on the actual size variation of the fabric, the double-layer protection coverage varied with the size of the bag-shaped hollow interlayers, as shown in the results. Figure 8 As shown in (b), with the same fabric size, as the size of the bag-shaped hollow interlayer increases, the number of gaps between a row of bag-shaped hollow interlayers decreases, and the area occupied by the connecting part decreases. That is, the double-layer protective area of ​​the fabric increases, and the probability of the fabric resisting external forces increases.

[0069] Based on the hanging angle and drooping height of five types of knitted multilayer hollow heterogeneous tubular anti-stab fabrics containing anti-stab blocks under a ruler, the bending stiffness of the fabric can be calculated using the following formula (1).

[0070] Formula (1): G=mh 3 ×10 -3 ;

[0071] Where: G represents bending stiffness (mN·cm), and m represents the weight per square meter of the scale fabric (g / m²). 2 ), where h represents the drop height (cm).

[0072] According to formula (1), it can be found that the bending stiffness of a material is positively correlated with its basis weight and sag height. The greater the bending stiffness of the material, the better the flexibility of the fabric. Since the transverse and longitudinal directions of the fabric exhibit similar bending stiffness patterns, such as Figure 8 As shown in (c), it can be observed that as the size of the bag-shaped hollow interlayer decreases, the bending stiffness of the fabric increases and the flexibility of the fabric improves.

[0073] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A method for preparing a knitted multilayer hollow heterogeneous tubular stab-resistant fabric, characterized in that, The knitted multi-layer hollow heterogeneous tubular structure stab-proof fabric is a three-dimensional tubular structure formed by connecting the front and back pieces of fabric. It includes: a wear-resistant outer layer, a skin-friendly inner layer, and several three-sided connected, one-sided open bag-shaped hollow interlayers formed by turning needles between the wear-resistant outer layer and the skin-friendly inner layer. The bag-shaped hollow interlayers are replaceably provided with stab-proof blocks. The method uses a four-needle bed computerized flat knitting machine for knitting, and the method includes: S1. Cast-on knitting: Knit full stitches on the back knit and front knit needle beds in sequence to complete the knitting of the 1st and 2nd rows; turn the loops 1 every other stitch on the back knit needle bed to the front purl needle bed, knit 1 every other stitch on the back knit needle bed, then turn the loops of the front purl needle bed back to complete the back piece of the tubular fabric, i.e., the knitting of the 3rd row; turn the loops 1 every other stitch on the front knit needle bed to the back purl needle bed, knit 1 every other stitch on the front knit needle bed, then turn the loops of the back purl needle bed back to complete the front piece of the tubular fabric, i.e., the knitting of the 4th row; repeat the 3rd and 4th rows a times to complete the cast-on knitting; S2, Main Body Knitting: The loops of the front lower and back lower needle beds are selectively turned to the back upper and front upper auxiliary needle beds, respectively, to control the loop formation and complete the multi-layer structure knitting. At the position where the abrasion-resistant outer layer and the skin-friendly inner layer intersect, the front abrasion-resistant outer layer is selectively left unstitched, while the front skin-friendly inner layer is formed by floating yarn, so that the loops of the abrasion-resistant outer layer are turned to the skin-friendly inner layer, creating a cross-linking effect between the abrasion-resistant outer layer and the skin-friendly inner layer. By cycling the longitudinal row of the puncture-resistant hollow structure unit 2m times, the number of bag-shaped hollow layers in a cylindrical transverse row is controlled, and the width of the knitted multi-layer heterogeneous cylindrical puncture-resistant fabric is determined. Cycling the cylindrical transverse row n times yields the height of the puncture-resistant hollow structure unit. At this point, the bag-shaped hollow layer is double-opened, and one side of the bag-shaped hollow layer is closed to complete the knitting of the 2+2a+2n transverse row, thus ending the main body knitting. S3. Finishing Knitting: Perform full stitch knitting on the back bottom and front bottom needle beds in sequence, repeating a times; Insert anti-stab blocks detachably into the pocket-shaped hollow interlayer to resist stabs and cuts. The anti-stab blocks are constrained by the fabric and are arranged in an array of overlapping and interlaced shapes.

2. A method for preparing a knitted multilayer hollow heterogeneous tubular stab-resistant fabric, characterized in that, The knitted multi-layer hollow heterogeneous tubular structure stab-proof fabric is a three-dimensional tubular structure formed by connecting the front and back pieces of fabric. It includes: an abrasion-resistant outer layer, a skin-friendly inner layer, and a spacer layer between the abrasion-resistant outer layer and the skin-friendly inner layer. Several three-sided connected, one-sided open pocket-shaped hollow interlayers are formed between the abrasion-resistant outer layer and the spacer layer, and between the skin-friendly inner layer and the spacer layer, through a turning needle action. A stab-proof block can be replacedly provided in the pocket-shaped hollow interlayer. The method uses a four-needle bed computerized flat knitting machine for knitting, and the method includes: S1. Cast-on knitting: Knit full stitches on the back knit and front knit needle beds in sequence to complete the knitting of the 1st and 2nd rows; turn the loops 1 every other stitch on the back knit needle bed to the front purl needle bed, knit 1 every other stitch on the back knit needle bed, then turn the loops of the front purl needle bed back to complete the back piece of the tubular fabric, i.e., the knitting of the 3rd row; turn the loops 1 every other stitch on the front knit needle bed to the back purl needle bed, knit 1 every other stitch on the front knit needle bed, then turn the loops of the back purl needle bed back to complete the front piece of the tubular fabric, i.e., the knitting of the 4th row; repeat the 3rd and 4th rows a times to complete the cast-on knitting; S2. Main Body Knitting: The loops of the front and back bottom needle beds are flipped to the back and front top auxiliary needle beds respectively, controlling the loop formation to complete the multi-layer structure knitting. At the position where the left and right sides of the bag-shaped hollow interlayer formed by the abrasion-resistant outer layer and the spacer layer intersect, the loops of the abrasion-resistant outer layer are flipped to the spacer layer, and the loops of the spacer layer are flipped to the abrasion-resistant outer layer. At the position where the left and right sides of the bag-shaped hollow interlayer formed by the spacer layer and the skin-friendly inner layer intersect, the loops of the spacer layer are flipped to the skin-friendly inner layer, and the loops of the skin-friendly inner layer are flipped to the spacer layer. This process is repeated 2m times in the longitudinal row of the puncture-resistant hollow structure unit to control the number of bag-shaped hollow interlayers in a tubular horizontal row, determine the width of the knitted multi-layer heterogeneous tubular structure puncture-resistant fabric, and obtain a complete tubular horizontal row. By repeating the tubular horizontal row n times, the height of the puncture-resistant hollow structure unit can be obtained. At this time, the bag-shaped hollow interlayer is double-opened, and one side of the bag-shaped hollow interlayer is closed to complete the knitting of the 2+2a+2n horizontal row, that is, the main body knitting is completed. S3. Finishing Knitting: Perform full stitch knitting on the back bottom and front bottom needle beds in sequence, repeating a times; Insert anti-stab blocks detachably into the pocket-shaped hollow interlayer to resist stabs and cuts. The anti-stab blocks are constrained by the fabric and are arranged in an array of overlapping and interlaced shapes.

3. A knitted multilayer hollow heterogeneous tubular structure stab-resistant fabric, prepared according to the method for preparing the knitted multilayer hollow heterogeneous tubular structure stab-resistant fabric according to claim 1 or 2, characterized in that, The knitted multi-layer hollow heterogeneous tubular stab-resistant fabric is prepared by integral forming using a four-needle bed computer flat knitting machine.

4. The knitted multilayer hollow heterogeneous tubular structure stab-resistant fabric according to claim 3, characterized in that, The stab-proof block is a hard stab-proof block.

5. The knitted multilayer hollow heterogeneous tubular stab-resistant fabric according to claim 4, characterized in that, The hard stab-resistant block includes at least one of resin, alloy, and metal armor plate.

6. A knitted multilayer hollow heterogeneous tubular structure stab-resistant fabric, prepared according to the method for preparing the knitted multilayer hollow heterogeneous tubular structure stab-resistant fabric according to claim 1, characterized in that, Several of the aforementioned bag-shaped hollow interlayers are arranged in a regular array.

7. A knitted multilayer hollow heterogeneous tubular stab-resistant fabric, prepared according to the method for preparing the knitted multilayer hollow heterogeneous tubular stab-resistant fabric according to claim 2, characterized in that, Several of the aforementioned bag-shaped hollow interlayers are arranged in a regular array and stacked.

8. A stab-proof garment, made from the knitted multilayer hollow heterogeneous tubular structure stab-proof fabric as described in any one of claims 3 to 7.

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