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

High-strength warp-knitted fabric

Technical Field

The invention relates to the technical field of spinning, in particular to a high-strength warp knitted fabric.

Background

Warp knit fabrics can be classified into tight fabrics, open mesh fabrics, elastic fabrics, non-elastic fabrics or tubular fabrics and flat fabrics, wherein open mesh, open single knit fabrics can be used for space antennas, filter materials and fishing nets; the compact single-sided knitted fabric can be used for coating or manufacturing medical supplies and the like; the weft-inserted single-sided warp-knitted fabric can be used for composite materials such as tire cord fabrics, propeller blades, windmill sails and the like, and reinforced materials such as bulletproof fabrics, PVC coatings and the like. At present, warp knitting products are widely applied to the industrial fields of industry, agriculture, geotechnical engineering, aerospace, biomedical treatment and the like, and have positive propulsion effect on the development of various industries.

When the fabric is applied to certain specific industrial fields, special requirements are required on the performance of the fabric, such as large-scale sun shading fabric, waterproof tarpaulin, reinforced framework of an airplane and the like, and the fabric is required to have high strength, small transverse and longitudinal extensibility, good dimensional stability and the like. For such fabrics with special requirements, both the weaving machine and the process design have a significant impact on the performance of the fabric.

Compared with woven fabrics and weft-knitted fabrics, warp-knitted fabrics are relatively stable in terms of structural stability. The woven fabric is formed by interweaving warp yarns and weft yarns, has edge tearing property, and the warp yarns or the weft yarns can be torn out from the selvedge; the weft-knitted fabric is formed by knitting one or more weft yarns, has the advantages of detachability, easy deformation of weft-knitted loops and high ductility in the warp and weft directions, and the fabric edge loops can be detached from the fabric. The warp knitted fabric is formed by warp knitting of a plurality of groups of yarns, the connected yarns are looped and sleeved with each other, the upper and lower transverse rows and the left and right longitudinal rows are connected through the extension lines, and the deformation degree of the fabric is smaller due to the existence of the extended extension lines, so that the structure is relatively stable. In terms of structural elasticity (elasticity generated by a fabric structure), the extensibility of the warp direction and the extensibility of the weft direction of the woven fabric are small, the extensibility of the warp direction and the extensibility of the weft direction of the weft-knitted fabric are large, and the extensibility of the warp direction and the extensibility of the weft direction of the warp-knitted fabric can be adjusted according to different processes and yarns.

Generally, the woven fabric has small transverse and longitudinal extensibility, but the warp yarns and the weft yarns only penetrate through each other, so that the stability is relatively poor, and the strength is low. Weft-knitted fabrics are also less stable than warp-knitted fabrics and more malleable than warp-knitted fabrics. The yarns in the warp knit are looped around each other and therefore have a good strength, but have a large elongation in the transverse and longitudinal directions compared to the woven fabric. However, the extensibility of warp-knitted fabrics is related to the number of bars, yarns and weave, and some warp-knitted fabrics are extensible in both the cross direction and the machine direction, but some have good dimensional stability, depending on the process design. Therefore, the method is worthy of research and has wide application prospect by obtaining the high-strength mesh fabric or special-purpose fabric through process design.

In the prior art, US6477865 discloses a three-dimensional knitted fabric which is a three-dimensional knitted mesh fabric comprising a front net and a rear net, and a three-dimensional marquelite-like structure of connecting yarns and inlaid yarns connecting between the front net and the rear net. The fabric has good dimensional stability and shape retention (low extensibility). And has better tensile strength in both the transverse direction and the longitudinal direction. The fabric is formed by weaving a double-needle bar Raschel warp knitting machine, the fabric is thick, other substances can be filled in the inner layer of the three-dimensional structure, and the surface of the fabric is rough. For certain applications, such as sun-shading and water-proofing fabrics for large gyms, high strength and dimensional stability must be maintained without increasing the thickness of the fabric, and the three-dimensional fabric is not suitable for use.

US20200190713 discloses a warp knit fabric having excellent tear strength woven from yarns fed from at least three guide rods (including a front guide rod, a middle guide rod, and a rear guide rod), wherein the rear yarn fed from the rear guide rod 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 in a weft direction, each of the front yarn and the middle yarn alternately forms a stitch forming texture and an insertion texture in a warp direction, and the insertion texture formed by the front yarn and the insertion 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 alternately exposed at least in the warp direction on sinker loops of the rear yarn. The fabric has good strength, but the fabric is elastic and has great extensibility, especially in the cross direction.

Disclosure of Invention

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

The purpose is achieved through the following technical scheme:

warp knitting refers to a process of forming a fabric by simultaneously knitting one or more sets of parallel arranged yarns on all the working needles of a warp-feed knitting machine. The formed loops are arranged along the warp direction and are formed by mutually sleeving adjacent yarns. During the sleeving process, each yarn is controlled by a separate needle. In warp knitting, yarns are generally classified into looped and non-looped yarns. The looped yarns are knitted into a chaining structure, a weft reinforcement structure and the like, and the non-looped yarns are knitted into a weft insertion yarn, a jacquard structure and the like.

The knitting chain line is knitted to obtain the knitting chain structure of the fabric, and the knitting chain structure is characterized in that each stitch wale is formed by the same warp yarn, and each warp yarn is always laid on the same needle during knitting. The fabric formed by the chain stitch is in a strip shape, each longitudinal row in the chain stitch is not connected with each other, the longitudinal extensibility is small, and the longitudinal extensibility can be further reduced by commonly weaving the fabric by combining the chain stitch with other stitches. The chain stitch can be divided into a closed chain and an open chain according to different yarn laying methods, wherein two extension lines of the coil in the closed chain are crossed with each other, and two extension lines of the coil in the open chain are not crossed.

In order to increase the strength of the fabric in the warp direction and reduce the extensibility of the warp direction, warp-direction reinforcing lines are alternately arranged at the positions of adjacent needles of the zipper weaving. The warp-wise reinforcing threads are not looped around other yarns and alternate in warp direction around the adjacent needle locations of the pillar stitch, so that the warp-wise reinforcing stitches are S-shaped wound around the pillar stitch. The warp-wise reinforcing tissue is not looped, so there is no stretch caused by deformation of the loops after stretching, and the fabric has little extensibility in the warp direction.

Further, the warp-wise reinforcing tissue can be alternately moved in the warp direction along each coil of the chaining tissue, the shape of the warp-wise reinforcing tissue is S-shaped at the moment, or the warp-wise reinforcing tissue can be alternately moved by spacing a plurality of coils, and the shape of the warp-wise reinforcing tissue is stepped at the moment.

On the other hand, the warp-wise reinforcing structure of the fabric significantly enhances the strength of the fabric in the warp direction. And the fabric has different strengths by adjusting the thickness of the warp-wise reinforcing lines according to different application scenes. In general, the thicker the yarn is, the stronger the yarn is, for the same material. Because the warp-wise reinforcing wire does not need to be looped, yarns with different thicknesses can be selected according to different application scenes, for example, monofilaments, yarns or high-performance fibers of 30D to 1200D can be used as the warp-wise reinforcing wire. In contrast, the stitch of the chain stitch is arranged in a loop, the thicker the yarn is, the greater the friction force between the knitting needle and the yarn is, the difficulty in knocking over the loop in the knitting process is caused, and the quality of the product is influenced; on the other hand, the thicker the yarn, the greater the displacement that the knitting needle needs to move during the knitting process, and since the maximum displacement that the knitting needle can swing is fixed, the too thick yarn causes the knitting difficulty and the normal knitting can not be realized. Typically, the yarns that need to be looped are no more than 300D. The common yarns for the chaining organization are 50 to 150D.

The increased strength of the fabric in the warp direction is greatest when warp reinforcement threads are wrapped around each wale of the pillar weave. According to different use scenes, from the perspective of saving raw materials, the warp-wise reinforcing lines can be arranged on the chaining tissues at any interval, for example, one warp-wise reinforcing line is arranged on every other chaining tissue; or every several chaining tissues are provided with a warp-wise reinforcing thread.

The warp-wise reinforcing yarns are generally yarns with low extensibility, such as polyester. Special or functional yarns can be used according to requirements, such as high-performance fibers such as high-strength polyester, aramid, carbon fibers, ultra-high molecular weight polyethylene fibers, glass fibers, basalt fibers and the like, natural fibers such as cotton, hemp, wool, silk and the like, and functional fibers such as artificial fibers, flame retardant fibers, antibacterial fibers, conductive fibers and the like. The woven fabric has high strength and corresponding functionality.

The wales of the pillar stitch and the warp-wise reinforcing stitch are not connected with each other, and each wale is formed by the same warp yarn. One or more non-looped weft interlining yarns are periodically padded between the loop stems and the spreading yarns of the warp knitted fabric to form the weft interlining padding yarns of the fabric. The weft-inserting thread is not looped and is clamped by the loop trunk and the extension thread of the knitted chain stitch, and the turning part of the weft-inserting thread is hung on the extension thread of the upper and lower rows. The individual wale stitches are tied together by the inlay weft yarns to form the fabric.

The warp knitting structure in which the warp knitting yarn produces different patterns by changing the number of needle pitches of the inlay yarn in the knitted ground as the wale stitch is connected in the lateral direction is called a jacquard warp knitting structure. The jacquard guide needle for controlling the jacquard threads can independently pad the threads in a certain range, so that patterns with unlimited sizes can be knitted. In addition, the jacquard yarns can respectively form three different styles of patterns, namely mesh patterns, thin patterns and thick patterns. On the fabric, three patterns with different styles can be randomly arranged according to the use scene. For a special application field, the jacquard yarns can also be functional yarns, in the application, heat insulation yarns are adopted as the jacquard yarns, the fabric with mesh tissues, thin tissues and thick tissues is obtained by weaving, the jacquard tissues of the fabric can block infrared radiation, and the fabric can be used as a camouflage fabric because the thickness of the fabric is different and the shielding rate of the fabric to the infrared radiation is different, so that the fabric can simulate a natural environment outdoors. The heat-insulating yarn can be one or more of full-dull DTY yarn, aramid fiber or conductive fiber.

When the strength of the fabric needs to be increased in the weft direction, the fabric further comprises weft-direction reinforcing wires, the weft-direction reinforcing wires are woven on the front side of the fabric, the weft-direction reinforcing wires are subjected to back-of-needle transverse-moving yarn laying at least 3 needle pitches in each row, then the back-of-needle transverse-moving yarn laying is performed in the weft direction at least 3 needle pitches in the opposite direction, and the last needle position of each row is looped to form weft-direction reinforcing tissues of the fabric. The coils of the weft-wise reinforcing tissue can be open coils or closed coils. Because the weft-wise reinforcing lines transversely move at least 3 needle pitches in each row, the structure of the fabric is compact, and the strength of the weft direction and the warp direction is enhanced. Generally, the larger the needle pitch of the needle-back shog inlay yarn in the same course, the tighter the fabric structure and the stronger the fabric, but the difficulty of knitting is increased correspondingly. Through multiple tests, when the weft-wise reinforcing threads are used for 1-stitch or 2-stitch needle back traversing lapping, the strength of the fabric is slightly increased; when the needle back traversing lapping is more than 3 needles, the fabric structure is compact, and the strength is obviously enhanced; when the needle back sideslip yarn laying is more than 6 needles, the weaving difficulty is larger, and the thickness of the fabric is also obviously increased. Therefore, the weft reinforcement threads are preferably used for carrying out needle-back shogging with 3 to 6 needle pitches in the same row.

Because the weft-wise reinforcing threads are woven on the front side of the fabric, at each transverse needle position, the chaining tissues can press the extending threads of the weft-wise reinforcing threads, so that the fabric structure is compact. If the latitudinal reinforcement threads are woven on the reverse side of the fabric, and the middle needle position is transversely moved, the extending threads of the latitudinal reinforcement threads in the middle float on the surface of the fabric except for the last needle position in the transverse direction, so the structure is fluffy, the threads are easy to hook, and the strength of the fabric is reduced.

Besides making the structure of the fabric compact, the interlining weft can also enhance the strength of the weft of the fabric. The larger the stitch length of weft insertion threads transversely traversing, the denser the formed weft insertion yarns, and the smaller the extensibility of the weft direction. Through tests, the weft insertion threads are transversely moved by at least 3 needle pitches in the weft direction, and the ductility of the fabric in the weft direction is obviously reduced. The more needles of the weft insertion thread are traversed, the tighter the structure of the fabric is, the larger the thickness is, when the weft insertion thread traverses 6 needles or more, the thickness of the fabric is almost 2 times of that of the fabric when the weft insertion thread traverses 3 needles, and the weaving difficulty is obviously enhanced. In the application, the weft insertion line moves by 3 needle pitches in the weft direction at least, preferably, the weft insertion line transversely moves by 3 to 6 needle pitches in the weft direction, the fabric structure is compact, and the ductility in the weft direction is small.

Compared with the prior art, the invention has the following beneficial effects:

1. the high-strength warp-knitted fabric has the advantages that under the condition that the thickness of the fabric is not increased, the fabric has good strength and dimensional stability, the transverse extensibility and the longitudinal extensibility are small, and the high-strength warp-knitted fabric can bear further processing without deformation.

2. 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, the strength of the warp direction and the weft direction can be enhanced, different laying yarn motion schemes are designed according to different application scenes, and the strength of the fabric is enhanced at different oblique angles.

3. The warp-wise reinforcing tissues and other yarns are not looped and are wound on the chaining tissues, so that yarns with different thicknesses, such as yarns larger than 300D, can be used as the warp-wise reinforcing threads, and the yarns generally used for looping are smaller than 300D, so that the strength of the fabric in the warp direction can be greatly enhanced by the warp-wise reinforcing tissues. At the same time, the warp-wise reinforcing tissue enables the structure of the fabric to be more compact.

4. The technical scheme of the application can be applied to warp knitting fabrics of various styles and is used for increasing the strength of fabrics, such as sun-shading cloth, waterproof cloth, tents, engineering cloth, medical fixing bands, composite materials, camouflage fabrics and the like.

Drawings

FIG. 1 is a stitch construction and lapping movement diagram of a pillar stitch according to the present invention;

FIG. 2 is a diagram of the movement of an inlay yarn for the warp-wise reinforcement of the invention;

FIG. 3 is a coil structure view and an inlay yarn motion view of a weft-wise reinforcing thread of the present invention;

FIG. 4 is a diagram showing the movement of the inlay yarn of the inlay weft yarn of the present invention;

FIG. 5 is a motion diagram of the jacquard guide needle for yarn cushion in a three-needle range;

FIG. 6 is a diagram showing the movement of an inlay yarn according to example 1 of the present invention;

FIG. 7 is a pictorial view of a high strength infrared camouflage cover of the present invention;

FIG. 8 is an electron microscope image of the anti-snag high-precision medical barrier fabric of the present invention;

FIG. 9 is a diagram of weft-wise reinforcing threads after being snagged when woven on the back of the fabric.

Detailed Description

The present invention will be described in further detail with reference to the drawings and examples. The specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. In addition, it should be noted that, for convenience of description, only a part of structures related to the present invention, not all of the structures, are shown in the drawings.

Fig. 1 is a stitch structure diagram and a lapping motion diagram of a stitch chain structure in the present application, which are divided into a closed stitch chain and an open stitch chain according to different lapping methods, as shown in (1) and (2) in the figures, wherein the lapping number of the closed stitch chain (1) is 0-1//, and the lapping number of the open stitch chain (2) is 0-1/1-0//. Two extension lines of the coil in the closed-end chaining are crossed, and the two extension lines of the coil of the open-end chaining do not intersect. The pillar stitch of the present application may be an open pillar stitch or a closed pillar stitch.

Fig. 2 is a yarn laying movement diagram of the warp-wise reinforcing wires of the present application, the warp-wise reinforcing wires are arranged around the pillar stitch, in fig. 2, the yarn laying number of the pillar stitch is 0-1//, two adjacent needle positions of the pillar stitch are 0, 1, the warp-wise reinforcing wires alternately move around the adjacent needle positions of the pillar stitch in the warp direction and are wound on one side of the pillar stitch, the yarn laying number of the warp-wise reinforcing wires is 0-0/1-1//, and the warp-wise reinforcing wires can significantly enhance the strength of the woven warp direction and reduce the extensibility of the warp direction.

FIG. 3 is a diagram of a stitch pattern and lay-up motion for the weft reinforcement yarn of the present application, where the yarns in the middle are traversed except for the last stitch in the weft, with a lay-up number of 1-0/3-4//, where the yarns are laid over the 3-stitch backstitch in each course. The weft-wise reinforcing thread in the yarn laying mode is suitable for being woven on the front side of the fabric, the extending thread of the weft-wise reinforcing thread at each transverse needle position is pressed by using a chaining structure, the fabric has a compact structure, and meanwhile the using amount of the yarn can be reduced.

FIG. 4 is a diagram showing the motion of the weft insertion yarn laying of the present invention, wherein the weft insertion yarn is laid by traversing the back of the needle at 3 gauge in each course, the fabric structure is compact, and the extensibility in the weft direction is small.

FIG. 5 is a jacquard guide needle movement diagram for yarn cushion in a three-needle range. Wherein (1) when a jacquard guide bar transversely moves and pads yarns towards the right needle back and leftwards needle back, the jacquard guide needle does not deviate, the yarns are padded at two needle pitches, the pad yarn number of the jacquard yarn is 0-1/2-1//, and a thin structure is formed; (2) When a jacquard guide bar transversely moves to the right needle back for lapping, a jacquard guide needle deviates a needle pitch leftwards, lapping of two needle pitches is changed into lapping of a needle pitch, and the lapping number of jacquard yarn is 0-1//, so that a mesh structure is formed; (3) When a jacquard guide bar transversely moves and pads yarns towards the left needle back, a jacquard guide needle deviates a needle pitch leftwards, the two-needle-pitch pad yarns are changed into three-needle-pitch pad yarns, and the pad yarn number of the jacquard yarn is 0-2/3-2//, so that thick and dense tissues are formed.

Example 1

In this embodiment, the reinforcing threads are arranged in both the warp direction and the weft direction of the fabric, so that a high-strength warp knitted fabric is obtained. The fabric of this embodiment has a compact structure, low transverse and longitudinal extensibility, and good dimensional stability. The fabric can be applied to the field with high requirements on the strength and stability of textiles, such as large-scale sun-shading cloth in a gymnasium, compared with an opaque coating fabric, the warp-knitted fabric of the embodiment also has the functions of light transmission and air permeability, and meanwhile, the fabric has high strength and dimensional stability.

The fabric of this embodiment is woven from the binder yarns, weft reinforcement yarns, interlining yarns and warp reinforcement yarns. FIG. 5 shows a chaining line L of the present embodiment ₁ Weft direction reinforcing line L ₂ Weft insertion line L ₃ And a warp-wise reinforcing line L ₄ The yarn is made of terylene, wherein L ₁ Is FDY, L of 75D ₂ DTY, L of 200D ₃ DTY, L of 150D ₄ The FDY is 75D, the padding number of the obtained chain stitch is 1-0/0-1//, and the coil of the chain stitch is an open coil. The number of the lapping yarn of the weft-wise reinforcing tissue is 1-0/3-4//, in one course, the weft-wise reinforcing thread carries out needle back traverse lapping yarn with 3 needle pitches, loops are formed at the 3-4 position of the third needle position, then the needle back traverse lapping yarn is carried out with 3 needle pitches in the opposite direction, and loops are formed at the 1-0 position of the third needle position of the next course. The number of the weft insertion and padding yarn is 0-0/3-3//, in each row, the weft insertion line transversely moves 3 needle positions, and the weft insertion and padding yarn is filled into the back of the fabric without loops to form the weft insertion and padding yarn of the fabric. The yarn laying number of the warp-wise reinforcing lines is 0-0/1-1//, the warp-wise reinforcing lines move alternately in two needle positions of 0-0 and 1-1 without loops and are wound on one side of the chaining structure in an S shape to form the warp-wise reinforcing structure of the fabric. Wherein the chain weave is on the front side of the fabric, and the weft direction is enhancedThe weave is woven on the front side of the fabric, the weft inserted inlay yarns are woven on the back side of the fabric, and the warp-wise reinforcing weave is woven on the back side of the fabric.

With respect to the performance of the parametric fabric, the test methods and apparatus were as follows:

and (4) testing standard: GB/T3923.1-2013 part 1 textile-fabric tensile Properties: determination of breaking Strength and elongation at Break (Bar method)

Testing the instrument: YG026T-H type electronic fabric strength tester

The test method comprises the following steps: 5 samples of 30 cm multiplied by 5 cm are respectively cut in the warp direction and the weft direction for testing, and the average value of the breaking strength in the warp direction and the weft direction is calculated. The pretension force of the electronic fabric forcer is 2N, the upper and lower clamping distance is 200 mm, and the stretching speed is 100 mm/min.

The fabric obtained in example 1 was tested to have a tensile strength of 505.8N in the warp direction and an elongation at break of 56.5%; tensile strength in the weft direction was 1316.5N, elongation at break 52.7%.

Comparative example 1

The fabric strength properties obtained were as in example 1 except that the weft reinforcement yarns were not provided with the inlay yarn numbers as in example 1, and are shown in table 1:

TABLE 1

From the above table, it can be seen that when the latitudinal reinforcement thread traverses 1 or 2 needles back to back in one course, the strength of the fabric in the latitudinal direction is low, and when the latitudinal reinforcement thread traverses 3 needles or more, the fabric has high strength in both the latitudinal and longitudinal directions. And the more the weft reinforcing thread traverses the needles of the lapping yarn on the back of the needles, the tighter the structure of the fabric is, and the thickness of the fabric is also obviously increased. The weft-wise reinforcing lines can simultaneously increase the tensile strength of the fabric in the weft direction and the warp direction. When the weft reinforcing thread transversely moves by more than 6 needles, although the strength is high, the weaving difficulty of the fabric is high, and the fabric is heavy.

Comparative example 2

In this comparative example, weft-wise reinforcing threads were woven on the back of the fabric, all the other things being the same as in example 1. The fabric is tested, the tensile strength of the warp direction is 426.3N, and the elongation at break is 57.6%; the tensile strength in the weft direction was 1043.6N, and the elongation at break was 49.9%. And when the weft-wise reinforcing thread is woven on the back surface of the fabric, the yarn of the traversing part floats on the surface of the fabric, so that the structure is fluffy and the yarn hooking is easy. The tensile strength in the warp direction of example 1 was 505.8N, and the elongation at break was 56.5%; the tensile strength in the weft direction was 1316.5N and the elongation at break was 52.7%. Compared with the prior art, the warp stretching strength of the fabric is reduced by 15.7%, and the weft stretching strength is reduced by 20.7%. This comparative example uses the same amount of yarn as example 1 except that the weft reinforcement yarn is woven on the back or front of the fabric. When different weaving processes are adopted, the strength of the fabric is greatly influenced. The fabric appearance obtained from the different processes is also different. Therefore, when the latitudinal reinforcement line is woven on the front surface of the fabric, the lateral moving part of the latitudinal reinforcement line is pressed at each warp needle position by the chaining tissue, so that the fabric is compact in structure and high in strength in the latitudinal direction and the longitudinal direction.

Comparative example 3

In this comparative example, the same fabric strength properties as in example 1 were obtained except that the numbers of inlay yarns for the inlay and inlay yarns were different from those in example 1, as shown in Table 2:

TABLE 2

As can be seen from the above table, when the weft inserted threads traverse 1 or 2 stitches in one course, the strength of the fabric in the weft direction is significantly reduced compared to when the weft inserted threads traverse 3 stitches or more, and the fabric has a higher strength in the weft direction when the weft inserted threads traverse 3 stitches or more. And, the more the number of the weft insertion threads transversely move in the weft direction, the tighter the structure of the fabric is, and the thickness of the fabric is also obviously increased. When the weft insertion thread moves more than 6 needles laterally, the strength of the fabric can be enhanced, but the weaving difficulty of the fabric is large.

Comparative example 4

In this comparative example, the strength properties of the fabric obtained are shown in Table 3, except that the warp-wise reinforcing cords have a different thickness from example 1 and are otherwise the same as in example 1:

TABLE 3

As can be seen from the above table, the warp-wise tensile strength of the fabric can be increased significantly by the warp-wise reinforcing wires, the warp-wise tensile strength of the fabric 11 is 390.2N without the warp-wise reinforcing wires, the warp-wise tensile strength of the fabric 12 is 505.8N with the warp-wise reinforcing wires, and the warp-wise tensile strength is increased by 29.6%. The thicker the warp-wise reinforcing threads, the greater the strength of the fabric in the warp direction. Because the warp-wise reinforcing wires do not need to be looped, yarns with different thicknesses can be selected according to different application scenes, and the yarns from 30D to 1200D can be used as the warp-wise reinforcing wires. The warp-wise reinforcement does not significantly affect the tensile strength in the weft direction.

Comparative example 5

In this comparative example, the number of warp-wise reinforcing members was reduced, and the warp-wise reinforcing members were disposed at intervals in the zipper fabric, and the other parameters were the same as in example 1. When warp-wise reinforcing lines are arranged on the chaining tissues at intervals, namely the warp-wise reinforcing lines are arranged on the chaining tissue of one longitudinal row, the warp-wise reinforcing lines are not arranged on the adjacent chaining tissues, the warp-wise tensile strength of the obtained fabric is 435.1N, and the breaking elongation is 55.8%; the tensile strength in the weft direction was 1282.0N, and the elongation at break was 53.2%.

Example 2

Fig. 7 this example illustrates the application of the warp knitting process of the present application to a high strength infrared camouflage lining. The camouflage fabric enables the infrared emissivity of the target object to simulate or approach the surrounding environment by blocking infrared radiation, so that the target object is hidden to achieve the purpose of camouflage. The camouflage lining of the embodiment is woven by the chain knitting threads, the jacquard threads, the weft interlining threads and the warp-wise reinforcing threads. Wherein the chaining line can be an opening coil or a closed coil. And a warp-wise reinforcing line is arranged on one side of each group of the chain knitting fabric, the warp-wise reinforcing line can be polyester yarns from 30D to 1200D, and the thicker the yarn is, the stronger the fabric is. The lining weft is subjected to one-stitch-length lining weft yarn. The jacquard yarn is heat-insulating yarn, and can be one or more of full-dull DTY yarn, aramid fiber or conductive fiber. The jacquard yarn moves according to different lapping yarns to obtain a mesh tissue 1, a thin tissue 2 and a thick and dense tissue 3. Wherein 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 the mesh weave in the fabric is 10-30%, the area of the thin weave is 20-50%, and the area of the thick weave is 50-80%. The fabric of the embodiment can be used as a large camouflage fabric and covered on people or equipment. Because the blocking rate of each part of the fabric to infrared rays is different, the fabric simulates a natural environment and achieves the purpose of camouflage.

Example 3

The embodiment is a high-precision medical barrier fabric capable of preventing snagging. The fabric is woven by chain knitting threads and weft-wise reinforcing threads. The lapping number of the chain stitch is 1-0/0-1//, and the coil is an open coil. The number of the padding yarn of the weft-wise reinforcing tissue is 1-0/4-5//, in one course, the weft-wise reinforcing thread carries out needle back traversing padding yarn with 4 needle pitches, loops are formed at the fourth needle position of 4-5, then the needle back traversing padding yarn with 4 needle pitches in the opposite direction is looped at the third needle position of 1-0 of the next course. As shown in fig. 8, the latitudinal reinforcement threads are woven on the front surface of the fabric, and the lateral moving parts of the latitudinal reinforcement threads are pressed at each warp needle position by the chaining tissue, so that the fabric is compact in structure and high in strength in the longitudinal direction and the latitudinal direction.

When the weft-wise reinforcing wires are woven on the back of the fabric, the yarns of the traversing parts float on the surface of the fabric, the structure is fluffy, when a sharp object touches the surface of the fabric, the yarns of the traversing parts of the weft-wise reinforcing wires are hooked and stretched to cause the breakage of part of fibers in the yarns, and the broken fibers float on the surface of the fabric, so that the surface of the fabric is rough, the strength is reduced, and the appearance and the use are influenced. As shown in fig. 9, when the weft-wise reinforcing thread is woven on the back of the fabric, the fabric is a picture after the thread hooking.

Comparative example 6

In example 3, in order to further increase the strength of the medical barrier in the warp direction and to make the drapability of the fabric better, the fabric in this comparative example is woven from the zipper threads, the weft-direction reinforcing threads and the warp-direction reinforcing threads. Wherein the weft-wise reinforcing wires weave the front side of the fabric. And a warp-wise reinforcing line is arranged on each group of chain stitch to obtain the high-strength anti-snagging high-precision medical barrier fabric.

The foregoing shows and describes the general principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed.

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.

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