This paper demonstrates a virtual prototyping of origami carton folding process using flexible panels instead of using rigid panels. The aims of this work are, to study of contact forces between flexible panels and fingers and further also to explore different non-rigid materials to be considered as a panel-body in future for different synchronous carton folding applications. Similar to previous research, in this paper, the D-RAPS multi-finger robot has been used in simulation and the mechanism of the robot fingers are explained. That work also permits to investigate the torque between two panels.