Effect of Injection Molding Parameters on Residual Stress of Polycarbonate

The influences of injection molding parameters on the residual stress of polycarbonate specimens were investigated by using orthogonal method.The results show that the most significant factor is melt temperature followed by cooling time and mold temperature,and the injection pressure has less influence.Because of the rapid relaxation of molecule chain,the residual stress decreases with increasing the melt temperature.The residual stress which decreases gradually along the flow direction is concentrated and high around the gate.The different injection molding processes take little influence on the distribution of the residual stress.