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Impregnation Behavior During CFRTP Pipe Fabrication by Simultaneous Heating in Textile Preforming Process

Takumi Iwata, Tadashi Uozumi and Asami Nakai


In general, to product carbon fiber reinforced thermoplastics (CFRTP) a press molding machine and a mold are necessary. These initial equipment costs cause the increase in the production cost. An open mold method without using a mold is expected to reduce the production costs. Therefore, in this study, an open mold method have been developed. In the new molding method, an intermediate material, the stretch broken yarn with PA12 (SBY) was used. CFRTP pipe was fabricated by simultaneous heating in braiding process. The reinforcements were braided structure with 40 degree fiber orientation angle to the longitudinal direction. CFRTP pipes were molded by changing heating position in order to investigate the relationship between impregnation states and heating conditions. The impregnation states were quantified by measuring un-impregnation area from the cross-sectional observation after molding. Impregnation process was clarified by thermographic measurement and crosssectional observation of the molded composite. Furthermore, impregnation mechanism was clarified as below, (1) The braiding yarn was heated in individual and was impregnated before braiding point, (2) Braiding yarn was compressed to the mandrel by the tension at the braiding point.

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