CN115748080A - High-strength warp-knitted fabric - Google Patents

Abstract

The invention discloses a high-strength warp-knitted fabric, which improves the strength of the fabric by arranging a warp-wise reinforcing thread and/or a weft-wise reinforcing thread in warp-knitted fabrics with different purposes. The weft-wise reinforcing tissues are laid in the warp direction and the weft direction of the fabric simultaneously, so that the structure of the fabric is compact, and the warp-wise strength and the weft-wise strength can be enhanced simultaneously. The warp-wise reinforcing tissues can use yarns with different thicknesses, so that the strength of the fabric in the warp direction can be greatly enhanced. The technical scheme of the application can be used for fabrics of different styles such as compact fabrics, mesh fabrics and elastic fabrics in warp knitting fabrics. The high-strength warp knitted fabric obtained by knitting can be applied to the fields of sun-shading cloth, waterproof cloth, tents, engineering cloth, medical fixing bands, composite materials, camouflage fabrics and the like.

Description

A high-strength warp knitted fabric

technical field

The invention relates to the technical field of textiles, in particular to high-strength warp knitted fabrics.

Background technique

Warp knitted fabrics can be divided into compact fabrics, mesh fabrics, elastic fabrics, non-elastic fabrics or cylindrical fabrics and flat fabrics, of which mesh loose single jersey fabrics can be used for aerospace antennas, filter materials and fishing nets; dense single jersey fabrics can be used For coating or making medical supplies, etc.; weft-inserted single-sided warp knitted fabrics can be used for composite materials such as tire cords, propeller blades, and windmill sails, as well as reinforcing materials such as bulletproof fabrics and PVC coatings. At present, warp knitting products have been widely used in industries such as industry, agriculture, geotechnical engineering, aerospace and biomedicine, and have played a positive role in promoting the development of various industries.

When the fabric is used in some specific industrial fields, there are special requirements for the performance of the fabric, such as large-scale sunshade fabrics, waterproof tarpaulins, aircraft reinforcement skeletons, etc. The fabrics are required to have high strength and low lateral and longitudinal extensibility. , Good dimensional stability, etc. For such fabrics with special requirements, the weaving machine and process design have a significant impact on the properties of the fabric.

Compared with woven fabrics and weft-knitted fabrics, warp-knitted fabrics are relatively stable in terms of structural stability. Woven fabrics are interwoven with warp yarns and weft yarns, and have edge-tearing properties, and the warp yarns or weft yarns can be pulled out from the edges of the fabric; The loops can be detached from the fabric, and the weft-knitted loops are easy to deform, and have great ductility in the warp and weft directions. The warp-knitted fabric is made of many groups of yarns warp-wise, and the connected yarns form loops and sleeves with each other, and connect the upper and lower rows and left and right wales through extension threads. The existence of straight extension threads makes the fabric more deformable. Small, so the structure is relatively stable. In terms of structural elasticity (elasticity produced by the fabric structure), the warp and weft directions of woven fabrics have little extensibility, and weft knitted fabrics have great extensibility in both warp and weft directions. The extensibility can be adjusted according to different processes and yarns.

Generally speaking, the horizontal and vertical stretch of woven fabrics is small, but the warp and weft yarns are only interspersed with each other, the stability is relatively poor, and the strength is low. The stability of weft knitted fabric is also lower than that of warp knitted fabric, and its extensibility is greater than that of warp knitted fabric. The yarns in the warp knitted fabric are looped and looped with each other, so the strength is better, but the transverse and longitudinal extensibility is greater than that of the woven fabric. However, the ductility of warp-knitted fabrics is related to the number of bars, yarns and weaves. According to different process designs, some warp-knitted fabrics have transverse and longitudinal ductility, but some fabrics have good dimensional stability. . Therefore, it is worthy of research to obtain high-strength, mesh fabrics or special-purpose fabrics through process design, and has broad application prospects.

In the prior art, US6477865 discloses a three-dimensional knitted fabric, which is a three-dimensional knitted mesh fabric, including a front net and a rear net, and a three-dimensional horse made of connecting yarns and inlaid yarns connected between the front net and the rear net. Quesset-like structure. The fabric has good dimensional stability and shape retention (low stretch). And it has good tensile strength in both transverse and longitudinal directions. The fabric is woven by a double-needle bed Raschel warp knitting machine. The fabric is relatively thick, and the inner layer of the three-dimensional structure can be filled with other substances, and the surface of the fabric is relatively rough. For some specific applications, such as sunshade and waterproof fabrics for large gymnasiums, high strength and dimensional stability must be maintained without increasing the thickness of the fabric, and the three-dimensional fabric is not suitable.

US20200190713 discloses a warp knitted fabric with excellent tear strength, which is braided by yarns fed from at least three guide rods (including front guide rods, middle guide rods and rear guide rods), wherein the yarn fed from the rear guide rods The back yarn forms a rope knitting texture, the front yarn fed from the front guide rod and the middle yarn fed from the middle guide rod are alternately arranged along the weft direction, and each front yarn and middle yarn alternately form stitches in the warp direction to form texture and Insert texture, and the insert texture formed by the front yarn and the insert texture formed by the middle yarn are alternately arranged at least in the warp direction, so that the front yarn and the middle yarn are exposed alternately in the warp direction on the sinker ring of the rear yarn at least. The fabric has good strength, but the fabric is elastic, especially in the transverse direction with great extensibility.

Contents of the invention

The present invention improves the strength of the fabric by arranging warp and/or weft reinforcing threads in warp knitted fabrics for different purposes.

Through the following technical solutions to achieve the above purpose:

Warp knitting refers to the process of using one or several groups of yarns arranged in parallel to form loops at the same time on all the working needles of the warp-feeding knitting machine to form a fabric. The formed loops are arranged along the warp direction and are formed by nesting adjacent yarns. During the nesting process, each yarn is controlled by an individual needle. In warp knitting, yarns are generally divided into looped and non-looped yarns. Among them, the looped yarns are woven into knitting chain weaves, weft-reinforced weaves, etc., and the non-looped yarns are woven into weft-inserted yarns, jacquard weaves, etc.

The knitting chain structure of the fabric is obtained by weaving the chain line, which is characterized in that each coil wale is formed by the same warp yarn, and each warp yarn is always formed by laying yarn on the same needle during weaving. The fabric formed by the braided chain weave is strip-shaped, and the longitudinal rows in the braided chain weave are not connected to each other, and the longitudinal extensibility is small. Generally, it is used to weave fabrics with other tissues to further reduce the longitudinal extensibility. The knitting chain structure can be divided into closed knitting chain and open knitting chain according to the different yarn laying methods, in which the two extension lines of the loop in the closed knitting chain cross each other, and the two extension lines of the loop in the open knitting chain do not intersect.

In order to increase the strength of the fabric in the warp direction and reduce the extensibility in the warp direction, the warp direction reinforcement threads are arranged alternately at the adjacent needle positions of the knitting chain. The warp reinforcement thread and other yarns do not form loops, and move alternately around the adjacent needle positions of the braided chain weave. Therefore, the warp direction reinforced weave is wound on the braided chain weave in an S-shape. There is no looping in the warp direction reinforcing tissue, so there is no extension caused by the deformation of the coil after stretching, and the fabric has little extensibility in the warp direction.

Further, the meridional reinforcing tissue can alternately move in the meridian direction along each coil of the braided chain tissue. At this time, the shape of the meridional reinforcing tissue is an "S" shape, or it can move alternately with several coils at intervals. At this time The shape of the meridional reinforcing tissue is stepped.

On the other hand, the warp direction reinforcement of the fabric significantly enhances the strength of the fabric in the warp direction. And according to different application scenarios, the fabric has different strengths by adjusting the thickness of the warp reinforcement threads. In general, for yarns of the same material, the thicker the yarn, the greater the strength of the yarn. Since the warp reinforcing thread does not need to be looped, yarns of different thicknesses can be selected according to different application scenarios. For example, 30D~1200D monofilament, yarn or high-performance fiber can be used as the warp reinforcing thread. In contrast, the knitting chain organization is set in loops, the thicker the yarn, the greater the friction between the knitting needle and the yarn, and it will be difficult to remove the loop during the weaving process, which will affect the quality of the product; on the other hand, the yarn The thicker the yarn, the greater the displacement that the knitting needle needs to move during the knitting process. Since the maximum displacement that the knitting needle can swing is fixed, too thick yarn will cause difficulty in knitting and cannot be knitted normally. In general, the yarn that needs to be looped is not more than 300D. The common yarn used for knitting chain organization is 50~150D.

When each wale of the braided chain is wound with a warp reinforcing thread, the increased strength of the fabric in the warp direction is the greatest. According to different usage scenarios, from the perspective of saving raw materials, it is also possible to set warp reinforcement lines on any interval of the chain organization, such as setting a warp reinforcement line every other chain organization; or every few The braided chain weave sets a warp-strengthening line.

Warp direction reinforcement yarns generally use yarns with low ductility, such as polyester. Special or functional yarns can also be used according to requirements, such as high-strength polyester, aramid, carbon fiber, ultra-high molecular weight polyethylene fiber, glass fiber, basalt fiber and other high-performance fibers, cotton, hemp, wool, silk, etc. Natural fibers, as well as functional fibers such as man-made fibers, flame-retardant fibers, antibacterial fibers, and conductive fibers. The woven fabric has high strength and corresponding functionality.

The wales of the braided chain weave and warp reinforcement weave are not connected to each other, and each coil wale is formed by the same warp yarn. Between the loops of warp-knitted fabrics and the extended threads, one or several non-looped weft-inserted threads are periodically inserted to form the weft-inserted yarn of the fabric. The inlay thread itself does not form a loop, but is clamped by the coil stem and extension thread of the knitting chain coil, and the turning point of the inlay thread is hung on the extension line of the upper and lower rows. The individual wale loops are linked together by weft inlays to form the fabric.

The jacquard thread can also be used as the horizontal connection between the wale coils. The jacquard thread produces changes in the number of stitches of the lapped yarn on the knitted fabric, thereby producing different patterns. Such a warp knitted structure is called jacquard. Warp organization. The jacquard guide needle controlling the jacquard thread can independently move the lap yarn within a certain range, so it can weave patterns with unlimited sizes. Moreover, the jacquard thread can form three different styles of patterns: mesh weave, thin weave and thick weave. On the fabric, three different styles of patterns can be set arbitrarily according to the usage scene. For special application fields, the jacquard thread can also be a functional yarn. In this application, heat-insulating yarns are used as the jacquard thread to weave a fabric with a mesh structure, a thin structure and a dense structure. The card structure can block infrared radiation, and because the thickness of the fabric is different, the shielding rate of infrared radiation is different, and the natural environment is simulated outdoors, so the fabric can be used as a camouflage fabric. It can be used as one or more of all-dull DTY yarns, aramid fibers or conductive fibers as heat-insulating yarns.

When the fabric needs to increase the strength in the weft direction, it also includes the weft reinforcement thread. The weft reinforcement thread is woven on the front of the fabric. In each course, the weft reinforcement thread is at least 3 stitches away from the back of the needle. Carry out at least 3 stitches in the weft direction in the reverse weft direction, and make a loop at the last needle position of each course to form a weft reinforced weave of the fabric. The coils of latitudinal reinforcement tissue can be open coils or closed coils. Since the weft reinforcement threads are traversed by at least 3 stitches in each course, the structure of the fabric is compact, and the strength in the weft and warp directions is enhanced at the same time. Generally speaking, in the same row, the more the stitches of the back of the needle are traversed, the tighter the fabric structure will be, and the stronger the fabric will be, but the difficulty of weaving will be increased accordingly. After many tests, the strength of the fabric increases slightly when the weft reinforcement thread is moved across the back of the needle for 1 or 2 stitches; when the back of the needle is moved over 3 stitches, the fabric has a tight structure and significant strength Reinforcement; when the back of the needle moves more than 6 needles, the weaving is more difficult, and the thickness of the fabric also increases significantly. Therefore, preferably, the weft reinforcement thread is traversing the back of the needle for 3 to 6 gauges in the same course.

Since the weft reinforcing thread is woven on the front of the fabric, at each horizontal needle position, the knitting chain structure can press the extension line of the weft reinforcing thread to make the fabric structure tight. If the weft reinforcing thread is woven on the reverse side of the fabric, and the middle needle position is moved laterally, except for the loop at the last needle position in the horizontal direction, the extension line of the weft reinforcing thread in the middle is floating on the surface of the fabric, and the structure is fluffy. And it is easy to snag, and the strength of the fabric is reduced.

In addition to making the structure of the fabric tight, the weft insertion can also enhance the weft strength of the fabric. The larger the needle pitch of the weft inlay is, the denser the weft inlay yarn will be formed, and the less extensibility in the weft direction will be. After testing, the weft inlay is moved across at least 3 stitches in the weft direction, and the fabric's extensibility in the weft direction is significantly reduced. The more stitches the weft inlay traverses, the tighter the structure of the fabric and the greater the thickness. When the weft inlay traverses 6 needles or more, the thickness of the fabric is almost twice that of 3 needles, and the difficulty of weaving is also greater. Visibly enhanced. In the present application, the weft inlay moves at least 3 stitches in the weft direction, preferably, the weft inlay moves 3 to 6 stitches laterally in the weft direction, so that the fabric has a compact structure and low weft extensibility.

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

1. The high-strength warp-knitted fabric of the present application has good strength and dimensional stability without increasing the thickness of the fabric, and has little lateral and longitudinal extensibility, and can withstand further processing without deformation.

2. The weft-intensified organization simultaneously lays yarns in the warp and weft directions of the fabric to make the structure of the fabric tighter, which not only enhances the strength in the warp and weft directions, but also designs different laying motion schemes according to different application scenarios. Increase the strength of the fabric at different angles.

3. The warp direction reinforcing structure of this application does not form loops with other yarns, and is wound on the knitting chain structure. Therefore, the warp direction reinforcing line can use yarns of different thicknesses, such as yarns greater than 300D, which are generally used The yarns used for forming loops are all less than 300D, therefore, the warp direction reinforcement structure can greatly enhance the strength of the fabric in the warp direction. At the same time, warp reinforcement can make the structure of the fabric more compact.

4. The technical solution of this application can be applied to warp knitted fabrics of various styles to increase the strength of fabrics, such as sunshade cloth, waterproof cloth, tents, engineering cloth, medical fixing straps, composite materials, camouflage fabrics, etc.

Description of drawings

Fig. 1 is the loop structure diagram and lap yarn movement diagram of knitting chain organization of the present invention;

Fig. 2 is a kind of laying yarn movement diagram of warp direction reinforcing thread of the present invention;

Fig. 3 is a kind of loop structure diagram and laying motion diagram of weft reinforcing thread of the present invention;

Fig. 4 is the kinematic diagram of the laying yarn of the present invention;

Fig. 5 is a movement diagram of the jacquard yarn guide needle in the range of three needles in the present invention;

Fig. 6 is the kinematic figure of lapping yarn of embodiment 1 of the present invention;

Fig. 7 is the physical figure of a kind of high-strength infrared camouflage fabric of the present invention;

Fig. 8 is the electron micrograph of a kind of anti-snag high-precision medical curtain fabric of the present invention;

Fig. 9 is a physical picture of the weft reinforcing thread after being hooked when it is woven on the back of the fabric.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The specific embodiments described here are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, only some structures related to the present invention are shown in the drawings but not all structures.

Figure 1 is the coil structure diagram of the knitting chain organization and the yarn laying movement diagram in this application. According to the different yarn laying methods, it can be divided into closed knitting chain and open knitting chain, as shown in (1) and (2) in the figure respectively , wherein the lapping number of the closed knitting chain (1) is 0-1//, and the lapping number of the open knitting chain (2) is 0-1/1-0//. The two extension lines of the coil in the closed-end chaining are intersected, and the two extension lines of the open-end chaining coil are not intersecting. The chaining organization of the present application may be an open chaining organization or a closed chaining organization.

Fig. 2 is a kind of laying motion diagram of the warp reinforcement thread of the present application, the warp direction reinforcement thread is arranged around the knitting chain structure, in Fig. 2, the laying number of the knitting chain structure is 0-1//, the number of the knitting chain structure is The two adjacent needle positions are 0 and 1, and the warp direction reinforcing thread moves around the adjacent needle positions of the knitting chain structure alternately in the warp direction, and is wound on one side of the knitting chain structure. 0/1-1//, the warp reinforcing thread can significantly enhance the warp strength and reduce the warp extensibility.

Fig. 3 is a loop structure diagram and laying yarn movement diagram of the weft reinforcing thread of the present application. In each course, the yarn is looped at the last needle position in the weft direction, and the yarn in the middle part is traversed. Its lapping number is 1-0/3-4//, and the yarn is carried out 3 needles in each course to traverse the lapping on the back of the needle. The weft reinforcing thread of this lapping method is suitable for weaving on the front of the fabric, and the weft reinforcing thread extension line of each horizontal needle position is pressed by the knitting chain structure, so that the fabric has a compact structure and can reduce the amount of yarn used.

Fig. 4 is the yarn laying motion diagram of the weft-inserted yarn of the present application. In each course, the weft-inserted yarn is moved across the back of the needle for 3 stitches to lay the yarn. The fabric structure is tight and the weft direction extensibility is small.

Fig. 5 is a movement diagram of the jacquard yarn guide needle lapping yarn within the range of three needles. Among them (1) is when the Jacquard bar traverses the lapping yarn to the right needle back and the left needle back traverses the lapping yarn, the Jacquard yarn guide needle does not deviate, and the two gauges are kept for lapping the yarn, and the Jacquard yarn Laying number is 0-1/2-1//, forming a thin weave; (2) shows that when the jacquard bar moves horizontally to the right needle back to inlay the yarn, the jacquard guide needle shifts to the left by one pitch , the two-gauge lap yarn becomes one-gauge lap yarn, and the lap yarn number of the Jacquard yarn is 0-1//, forming a mesh structure; (3) The Jacquard bar moves the lap yarn to the left needle back At this time, the Jacquard yarn guide needle shifts to the left by one pitch, and the two-gauge pad yarn becomes a three-gauge pad yarn, and the pad yarn number of the Jacquard yarn is 0-2/3-2//, forming a thick and dense organize.

Example 1

In this embodiment, reinforcing threads are provided in the warp and weft directions of the fabric at the same time to obtain a high-strength warp knitted fabric. The fabric of this embodiment has a compact structure, low transverse and longitudinal extensibility, and good dimensional stability. The fabric can be applied to fields that have high requirements for the strength and stability of textiles, such as large-scale sunshade fabrics for gymnasiums. Compared with opaque coated fabrics, the warp-knitted fabrics of this embodiment also have light-transmitting and breathable effects. At the same time the fabric has high strength and dimensional stability.

The fabric of this embodiment is woven from chain threads, weft reinforcing threads, weft insertion threads and warp reinforcing threads. Fig. 5 is the laying motion diagram of the knitting chain line L ₁ , the weft reinforcing line L ₂ , the weft inlay line L ₃ and the warp reinforcing line L ₄ in this embodiment. The yarns are all made of polyester, and L ₁ is 75D. FDY, L ₂ is 200D DTY, L ₃ is 150D DTY, L ₄ is 75D FDY, the lapping number of the obtained chain structure is 1-0/0-1//, and the loops of the chain structure are openings coil. The number of lapping yarns of the weft reinforcement structure is 1-0/3-4//, in one course, the weft reinforcement thread performs 3 stitches of needle back traverse lapping, and the third needle position is 3-4 Then, the needle back traverses the lap yarn for 3 gauges in the opposite direction, and forms a loop at the third needle position 1-0 in the next course. The numbers of the weft-inserted yarn are 0-0/3-3//. In each course, the weft-inserted thread moves 3 needle positions, and is inserted into the back of the fabric without loops to form the weft-inserted yarn of the fabric. The lapping number of the warp reinforcing thread is 0-0/1-1//, and the warp reinforcing thread moves alternately at the two needle positions of 0-0 and 1-1 without forming a circle, and is wound on the knitting chain in an "S" shape. One side of the tissue, forming the warp reinforcement of the fabric. Wherein, the knitting chain weave is woven on the front of the fabric, the weft reinforcing weaving is woven on the front of the fabric, the weft inlay yarn is woven on the back of the fabric, and the warp reinforcing weaving is woven on the back of the fabric.

Regarding the performance of parameter fabrics, the detection methods and instruments are as follows:

Test standard: GB/T 3923.1-2013 "Textiles - Tensile properties of fabrics Part 1: Determination of breaking strength and elongation at break (strip method)"

Test instrument: YG026T-H electronic fabric strength tester

Test method: Cut five samples of 30 cm×5 cm in the warp and weft directions respectively for testing, and calculate the average breaking strength in the warp and weft directions. The pre-tension of the electronic fabric strength tester is 2 N, the upper and lower clamping distance is 200 mm, and the tensile speed is 100 mm/min.

The fabric obtained in Example 1 has been tested. The tensile strength in the warp direction is 505.8 N, and the elongation at break is 56.5%; the tensile strength in the weft direction is 1316.5 N, and the elongation at break is 52.7%.

Comparative example 1

Except that the number of lap yarns of the weft reinforcing thread is different from that of Example 1, other are all the same as Example 1, and the fabric strength properties obtained are as shown in Table 1:

Table 1

It can be seen from the above table that when the weft reinforcing thread moves 1 or 2 needles across the back of a row, the strength of the fabric in the weft direction is low; when the weft reinforcing thread moves 3 needles or more, the fabric Both warp and weft have high strength. Moreover, the more the number of stitches that the weft reinforcement thread moves across the back of the needle, the tighter the structure of the fabric, and the thickness of the fabric increases significantly. The weft reinforcing thread can increase the tensile strength of the fabric in the weft and warp directions at the same time. When the weft reinforcing thread traverses more than 6 needles, although the strength is large, the weaving of the fabric is difficult and the fabric is thick and heavy.

Comparative example 2

In this comparative example, the weft reinforcing thread is woven on the back of the fabric, and the others are the same as in Example 1. After testing the fabric, the tensile strength in the warp direction is 426.3N, and the elongation at break is 57.6%; the tensile strength in the weft direction is 1043.6N, and the elongation at break is 49.9%. Moreover, when the weft reinforcing threads are woven on the back of the fabric, the yarns in the traversing part float on the surface of the fabric, and the structure is fluffy and easy to snag. The tensile strength in the warp direction of Example 1 is 505.8 N, and the elongation at break is 56.5%; the tensile strength in the weft direction is 1316.5 N, and the elongation at break is 52.7%. In comparison, the warp tensile strength of the fabric was reduced by 15.7% and the weft tensile strength was reduced by 20.7%. This comparative example has the same yarn consumption as that of Example 1, except that the weft reinforcing thread is woven on the back or front side of the fabric. When different weaving techniques are used, it has a greater impact on the strength of the fabric. The appearance of fabrics obtained by different processes is also different. Therefore, when the weft reinforcing thread is woven on the front of the fabric, the knitting chain structure will press the traverse part of the weft reinforcing thread at each warp needle position, so that the structure of the fabric is tight and the warp and weft strength is higher.

Comparative example 3

In this comparative example, except that the laying numbers of the weft-laying yarns are different from Example 1, others are the same as Example 1, and the fabric strength properties obtained are as shown in Table 2:

Table 2

It can be seen from the above table that when the weft inlay is moved across 1 or 2 stitches in a row, the strength of the fabric in the weft direction is significantly reduced compared to 3 stitches across, and when the weft inlay is moved across 3 stitches or more, the fabric It has higher strength in weft direction. Moreover, the more the number of needles that the weft inserting thread moves laterally in the weft direction, the tighter the structure of the fabric, and the thickness of the fabric will also increase significantly. When the inlaid thread traverses more than 6 needles, although the strength of the fabric can be enhanced, the weaving of the fabric is difficult.

Comparative example 4

In this comparative example, except that the thickness of the warp direction reinforcing thread is different from that of Example 1, others are the same as Example 1, and the strength properties of the obtained fabric are shown in Table 3:

table 3

It can be seen from the above table that the warp direction reinforcing thread can significantly increase the warp direction tensile strength of the fabric. Fabric 11 is not provided with warp direction reinforcing thread, and the warp direction tensile strength is 390.2N. Fabric 12 is provided with a warp direction of 75D. To the reinforcement line, the longitudinal tensile strength is 505.8N, and the strength has increased by 29.6%. The thicker the warp reinforcement threads, the greater the strength of the fabric in the warp direction. Since the warp reinforcing thread does not need to be looped, yarns of different thicknesses can be selected according to different application scenarios, and yarns of 30D~1200D can be used as warp reinforcing thread. The effect of warp reinforcing threads on weft tensile strength is not obvious.

Comparative example 5

In this comparative example, the number of warp reinforcing lines was reduced, and the warp reinforcing lines were set at intervals in the braided chain tissue, and other parameters were the same as in Example 1. When the warp reinforcing lines are arranged on the knitting chain organization at intervals, that is, a longitudinal knitting chain organization is provided with the warp direction reinforcing lines, and the warp direction reinforcing lines are not set on the adjacent knitting chain tissues, the warp direction of the obtained fabric is The tensile strength is 435.1N, and the elongation at break is 55.8%; the tensile strength in the weft direction is 1282.0N, and the elongation at break is 53.2%.

Example 2

Fig. 7 In this embodiment, the warp knitting process of the present application is applied to a high-strength infrared camouflage fabric. By blocking infrared radiation, the camouflage fabric makes the infrared emissivity of the target simulate or approach the surrounding environment, thereby hiding the target to achieve the purpose of camouflage. The camouflage fabric of this embodiment is woven from chain threads, jacquard threads, weft insertion threads and warp reinforcement threads. Wherein the braided chain line can be either an open loop or a closed loop. One side of each group of knitting chains is provided with a warp reinforcing thread, which can be 30D~1200D polyester yarn, and the thicker the yarn, the greater the strength of the fabric. Weft-inserted yarn for one gauge of weft-inserted yarn. Jacquard yarn is heat-insulating yarn, which can be one or more of full-dull DTY yarn, aramid fiber or conductive fiber. The jacquard thread obtains mesh weave 1, thin weave 2 and dense weave 3 according to different laying motions. Among them, the mesh tissue hardly blocks the emission of infrared rays, the thin tissue can block 20%~50% of infrared rays, and the thick tissue can block more than 80% of infrared rays. The area of mesh tissue in the fabric is 10%~30%, the area of thin tissue is 20%~50%, and the area of thick tissue is 50~80%. The fabric of this embodiment can be used as a large camouflage fabric to cover people or equipment. Because each part of the fabric has different blocking rates for infrared rays, it simulates the natural environment and achieves the purpose of camouflage.

Example 3

This embodiment is a high-precision medical curtain fabric with anti-snag. The fabric is woven from chain threads and weft reinforcement threads. The lap yarn numbers of the knitting chain organization are 1-0/0-1//, and the coils are open coils. The number of lapping yarns of the weft reinforcement structure is 1-0/4-5//, in one course, the weft reinforcement thread is traversing the back of the needle for 4 gauges, and the fourth needle position is 4-5 Knit at the position, then move the back of the needle in the opposite direction for 4 gauges, and form a loop at the third needle position 1-0 in the next course. As shown in Figure 8, the weft reinforcing thread is woven on the front of the fabric, and the knitting chain structure presses the traverse part of the weft reinforcing thread at each warp needle position, so that the structure of the fabric is tight and the warp and weft strength is high.

When the weft reinforcing thread is woven on the back of the fabric, the yarn of the traverse part floats on the surface of the fabric, and the structure is fluffy. When a sharp object touches the surface of the fabric, the traverse part of the weft reinforcing thread After the yarn is hooked and stretched, some fibers in the yarn are broken, and the broken fibers float on the surface of the fabric, making the surface of the fabric rough and reducing its strength, affecting appearance and use. As shown in Figure 9, when the weft reinforcing thread is woven on the back of the fabric, the picture of the fabric after snagging.

Comparative example 6

In Example 3, in order to further increase the strength in the warp direction of the medical curtain and at the same time make the drapability of the fabric better, the fabric in this comparative example is woven from chain threads, weft reinforcing threads and warp reinforcing threads. Wherein the weft reinforcement threads are woven on the front side of the fabric. Warp direction reinforcing lines are arranged on each group of knitting chains to obtain a high-strength anti-snag high-precision medical curtain fabric.

The basic principles, main features and advantages of the present invention have been shown and described above. Those skilled in the industry should understand that the present invention is not limited by the above-mentioned embodiments. What are described in the above-mentioned embodiments and the description only illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will also have Variations and improvements are possible, which fall within the scope of the claimed invention.

Claims (10)

1. A high strength warp knit fabric knitted by a warp knitting machine, characterized in that the fabric comprises at least a chain strand and warp direction reinforcing strands;

the chaining thread is knitted in a loop mode in the warp direction of the fabric to form a chaining tissue of the fabric;

arranging at least one warp-wise reinforcing line along the pillar stitch, wherein the warp-wise reinforcing line alternately moves on transversely adjacent needle positions of the pillar stitch to form a warp-wise reinforcing tissue of the fabric; the warp-wise reinforcing tissue is not looped with the pillar tissue.

2. The high-strength warp-knitted fabric according to claim 1, wherein the thickness of the warp reinforcing yarns is 30D to 1200D, and the high-performance fibers are monofilaments, yarns or high-performance fibers.

3. A high strength warp knit fabric according to claim 1 wherein at least one warp-wise reinforcing thread is provided along any of said pillar stitches; or at any interval, and is provided with at least one warp-wise reinforcing thread.

4. A high tenacity warp knit fabric as claimed in claim 1 wherein the fabric further comprises weft inserted inlay yarns woven in the weft direction of the fabric by inserting one or more weft inserted yarns in the back of the fabric without looping.

5. The high strength warp knit fabric according to claim 4, wherein the fabric further comprises a lift thread which forms a mesh structure, a thin structure and a thick structure of the fabric by different numbers of needles of the shog inlay yarn.

6. The high-strength warp-knitted fabric according to claim 5, wherein the jacquard threads are heat-insulating yarns, and the heat-insulating yarns are one or more of full-dull DTY yarns, aramid fibers or conductive fibers.

7. The high strength warp knit fabric of claim 1 further comprising a weft reinforcing thread having a backstitch underlap of at least 3 gauge per course and a backstitch underlap of at least 3 gauge per course in the opposite direction for the next course and looped at the last gauge of each course to form a weft reinforcing structure of the fabric.

8. A high strength warp knit fabric as claimed in claim 7 wherein the fabric further includes a weft inserted yarn, the weft inserted yarn being shoved with a backstitch of at least 3 gauge to form the fabric.

9. A high-strength warp knitted fabric, characterized in that the warp knitted fabric at least comprises chain knitting threads and weft-direction reinforcing threads, and the chain knitting threads are knitted in a loop manner in the warp direction of the fabric to form a chain knitting structure of the fabric; the weft-wise reinforcing lines are subjected to back-of-needle transverse lapping yarns with at least 2 needle pitches in each row, then back-of-needle transverse lapping yarns with at least 2 needle pitches in the next row are carried out in the opposite direction, and loops are formed at the last needle position of each row to form weft-wise reinforcing tissues of the fabric; the weft direction reinforcing tissues are woven on the front surface of the fabric.

10. A high strength warp knit fabric as claimed in claim 9, said fabric further comprising warp reinforcing yarns, said warp reinforcing yarns being alternately displaced at laterally adjacent needle locations of said pillar stitch to form warp reinforcing stitches of the fabric; the warp-wise reinforcing tissue is not looped with the pillar tissue and the weft-wise reinforcing tissue.

Images