Abstract:
Compared to traditional compression molding, continuous roll forming technology offers significant advantages of low production costs and ease of mass production for manufacturing continuous carbon fiber reinforced PEKK plates or profiles. However, controlling forming quality is extremely challenging due to the high melt viscosity of the resin and the coupled effects of multiple parameters, including temperature, pressure, speed, and roll gap. Addressing the difficulty of determining process parameters online during continuous production, this study established a static hot-pressing apparatus based on the concept of “equivalent reconstruction and process decoupling” to simulate the local characteristics of continuous roll forming. 0°/90°/0° lap specimens were prepared under varying temperatures and pressures to systematically investigate the thermo-mechanical coupling effects on interlaminar bond strength and thickness. Results indicate a non-monotonic dependence of bonding properties on process parameters. Appropriate parameters promote resin rheological wetting and molecular chain diffusion, whereas excessively high temperature and pressure lead to lateral resin overflow and interlaminar resin depletion. A peak strength of 16 MPa was achieved at 360℃ and 400 N, where the interfacial resin was fully melted, enabling effective molecular diffusion and entanglement. Based on the results, a quality criterion based on the optimal compaction ratio (24%-27%) is proposed, providing a theoretical basis for parameter optimization and quality control in continuous production lines.