The process of pultrusion is still in the stage of rapid development. From the perspective of development trends at home and abroad, it mainly produces large-scale, complex cross-section, thick-walled products, and the development focus is: new marine composite materials, power transmission, structural components for civil engineering, and high-rise building projects.
At present, the thickest pultrusion product abroad has reached 101.6mm. At the same time, the pultrusion process has also developed from the "black art" in the mold cavity to a more scientific experimental method, repeatedly verifying and studying the curing kinetics in the mold, and at the same time with the help of various Electronic equipment, resin injection, mold design, etc. continue to optimize quality and increase productivity. With the development of advanced equipment, processes that were previously considered unimaginable will continue to emerge.
Features of pultrusion:
First, the process is simple and efficient, and it is suitable for large-scale production of high-performance fiber composite materials. The pultrusion line speed is known to reach more than 4m/min, and the production efficiency can be further improved by producing multiple products at the same time.
Second, pultrusion can best play the reinforcing effect of fibers. In most composite manufacturing processes, fibers are discontinuous, which causes a great loss of fiber strength. Even if continuous fibers are entangled, there is a certain loss of strength due to fiber bending, overlapping, etc. For example, in helical winding, the tension of fibers is generally only 75% to 85%. In pultrusion, the fibers are not only continuous but also fully straightened, which is an ideal form to develop fiber strength.
Third, the quality fluctuation is small. The pultrusion process has a high degree of automation, few processes, short time, and the operation technology and environment have little impact on the product quality. Therefore, with the same raw materials, the quality stability of pultrusion products is higher than that of other process products.
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