It is reported that the woven plain fabric and the warp knitted biaxial fabric in the membrane material belong to the biaxial structure, and their warp yarns and weft yarns are arranged vertically to each other, but different organizational structures may lead to differences in performance. With the development of biaxial warp knitted fabrics, the research on their properties is also increasing. Researchers found that warp knitted biaxial fabrics have high potential utilization rate Membrane structure landscape It is widely used in construction, with small shrinkage, good combination with coating, high tear strength, and much higher production speed than woven fabric. Compared with traditional woven fabric reinforcement materials, warp knitted biaxial reinforcement fabrics have the following advantages:

(1) The tensile strength and elastic modulus are high. This is due to the high degree of orientation of each group of fibers in warp knitted fabrics, which jointly bear external loads, make full use of yarn potential, and the fabric has high tensile strength. Among them, the utilization ratio of yarn strength in the fabric to the theoretical strength of single yarn is 91.48% for warp and 85.72% for weft, while that of woven fabric is 73.56% for warp and 68.64% for weft. The utilization ratio of yarn strength has increased by 25%. This allows the fabric to reduce mass with high overall strength. From an economic point of view, it can save raw materials, thus reducing the production costs of membrane structure landscape and other projects. In addition, because the yarns in the fabric are arranged straightly, the crimp phenomenon of the yarns is solved, and the elastic modulus of the fabric is increased; At the same time, the damage of high modulus brittle fibers is greatly reduced during the knitting process.

(2) The tearing strength and tensile strength of woven fabrics are higher than those of woven fabrics. In the biaxial structure of warp knitting, the yarn has some mobility. When the fabric is torn, several yarns at the stress point gather together (bunching effect), which greatly increases the tear load and makes the fabric have good tear resistance. The yarn in the yarn layer of the fabric is straight, which means that the polymer macromolecules are straight. Therefore, even at low temperatures, this warp knitting structure has good tear strength and can resist crack propagation. The warp and weft yarns of woven fabrics cross each other. During the tearing process, the yarns are torn off one by one, and the tear opening is quite neat.

(3) The fabric has good drapability. The drapability of warp knitted biaxial reinforced fabric is adjusted by the loop system according to the weft insertion mechanism. The deformation capacity can be increased by increasing the loops and reducing the density of the weave.

(4) The shear property is good. The existence of binding yarn in warp knitted fabric can make the fabric resist the external shearing force in some aspects. If 45 ° yarn is inserted on the basis of warp knitted biaxial reinforced fabric, the shear performance of the fabric will be greatly improved.

(5) The coiling performance is excellent. Because the yarn is straight, the membrane structure landscape fabric is relatively flat and has excellent dimensional stability. It is tightly crimped and easy to be cut into some widths, so that it can be cut without deformation.

(6) The adaptability and economy of raw materials are high. The flat arrangement of warp and weft yarns in warp knitted biaxial fabric makes it possible to use any kind of basic fiber materials, including some fibers with high rigidity, such as glass fiber, carbon fiber, etc. The warp knitting process has its own speed and design flexibility, so that the structure and performance of warp knitted biaxial fabrics can be flexibly designed and realized.

(7) The fabric has low lateral shrinkage. During the coating process, the transverse shrinkage of warp knitting oriented structure is 1.5-2% (the transverse shrinkage of woven fabric is 5-6%). This low lateral shrinkage can make more economical use of the finishing width, and it is easy to control the square meter weight of the fabric.

(8) The surface of the coated fabric is flat. The parallel stretching of yarns and the application of untwisted yarns in the membrane structure landscape membrane materials make the surface of the coated fabric smooth, thus increasing the coiling length and improving the efficiency of the coating machine.

The content of this article comes from the network. If you have any questions, please contact me to delete it!