The specific weight of carbon fiber is less than one-fourth of that of steel, but its strength is seven to nine times that of steel. Due to its advantages of light weight and high strength, it is widely used in the downstream market, and the market demand continues to expand. At present, my country's carbon fiber industry is in a period of explosive growth. In the future, the growth rate of the carbon fiber demand market will remain at about 17%. With the entry of many capitals into the carbon fiber industry, carbon fiber technology has been continuously broken through, and the demand area will be further expanded. However, such an important material technology has been controlled by foreign countries for a long time. It was not until August 2022 that my country achieved a technological breakthrough, but the domestic demand requirements are still not met. Our demand for carbon fiber still relies on imports for a long time. If China wants to mass-produce high-quality carbon fiber, it needs to make breakthroughs in technology, equipment and production capacity. In the carbon fiber industry, carbon fiber bundles with more than 48,000 strands are usually called large-tow carbon fiber. At present, each bundle of carbon fiber in China is basically between 1,000 and 12,000 strands, which is called "small-tow". When carbon fiber is used as a structural material, the tensile strength of carbon fiber multifilament is an important mechanical performance index for evaluating the performance of carbon fiber, which can intuitively evaluate the quality of carbon fiber. Carbon fiber

Multifilament tensile strength specimens are currently generally produced by domestic manufacturers by artificially impregnating and winding, and manually cutting the specimens. This production process has the disadvantages of low efficiency, high labor intensity, low yield of specimens, harmful chemical components in the glue, and small fibers of carbon fiber that endanger the health of personnel. Although there are related uniaxial preparation devices abroad, they are expensive, have high subsequent maintenance costs, and are difficult to apply due to technical protection issues, which to a certain extent affect the improvement of carbon fiber product performance data and carbon fiber production capacity. Therefore, how to realize the automation of sample preparation to keep up with the rapid development of product production capacity is a problem that we urgently need to solve. In order to solve this problem, Sinopec Shanghai Petrochemical Company and Shanghai Shenkai jointly successfully developed the first domestic carbon fiber automatic impregnation and winding machine, filling the gap in the domestic automatic sample preparation of carbon fiber tensile performance test specimens, and promoting the development of large-scale production of carbon fiber in my country. As of now, the project has applied for three patents, and the relevant technology has reached the domestic advanced level, and the application data is comparable to similar international products. d