Integrated manufacturing of REciclable multi-material COmposites for the TRANSport sector

Provided in the present invention is a secondary impregnation filament-making method for a composite filament suitable for additive manufacturing. The method comprises: first performing a fiber spreading operation on fibers by means of a fiber spreading assembly, spraying a thermoplastic sizing layer onto the surfaces of the fibers by means of a thermoplastic sizing layer spraying and attaching assembly during the fiber spreading process, and then performing an impregnation treatment, wherein the fiber spreading assembly and the thermoplastic sizing layer spraying and attaching assembly are both installed on a machine frame. The present invention has the beneficial effects that the thermoplastic sizing layer is sprayed onto the surfaces of fibers during the fiber spreading process, and then a conventional impregnation treatment is performed, thereby making the impregnation degree of a continuous-fiber-reinforced composite filament high and reducing internal defects of a formed part; and by means of combining the thermoplastic sizing layer spraying and attaching assembly with the fiber spreading assembly, the degree of uniformity of the thermoplastic sizing layer on the surfaces of the fibers is effectively guaranteed, and the effect of the subsequent conventional impregnation treatment is guaranteed.

» Number: WO2025077110A1 (A1)

» Publication Date: 17/04/2025

» Applicant: NANJING UNIV OF AERONAUTICS AND ASTRONAUTICS?[CN]

» Inventor: SONG WENZHE?[CN]; SHAN ZHONGDE?[CN] (5)

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