As early as the 1980s, European and American countries put forward the concept of LFT. However, due to the fiber impregnation technology and the injection molding, molding process and production equipment of long fiber pellets, the research and application of thermoplastic staple fiber reinforcement, filling and other modification technologies were obtained. Great progress has been made, leading to slow progress in research on LFT technology. In the mid-1990s, with the rapid development of the automobile industry and people's awareness of environmental protection and energy conservation, especially the energy crisis and oil price hikes, the light weight of automobiles has become the development trend of new automobiles, and people are paying attention again. Force turned to the research and development of LFT.
