Post-Forming Method of Carbon Fiber Reinforced Thermoplastic Composite Using Stitching Technique

Abstract

Carbon fiber reinforced thermoplastic composites (CFRTPs) is getting increasing attention owing to their excellent mechanical properties, including low weight, fatigue resistance, and good recyclability [1]. There are different methods, such as autoclave, hot-press, and injection moulding, but there is no known technology for post-forming CFRTP that has been already manufactured. In this study, we introduce a new technology that can post-form a planar CFRTP into a three-dimensional structure using stitching technique. The laminated carbon fiber fabrics and polycarbonate (PC) films are stitched with conductive threads and then impgregnated with hot-press. When voltage is applied to the conductive thread, the CFRTP is partially heated along the thread. When the temperature reaches 150 °C (Glass transition temperature of PC) or higher, CFRTP can be folded along the thread. Therefore, once stitching is performed on a planar CFRTP with conductive thread as the sketch of paper origami [2], a new three-dimensional structure can be manufactured.