| 摘要 |
PROBLEM TO BE SOLVED: To obtain a set value of pressure being optimum for preparing an aimed molded article in a draw blow molding machine in a short time. SOLUTION: A draw blow molding machine provided with a pressure controlling device 3 for controlling pressure of air blown into a preform 12 based on set pressure, a pressure measuring device 4 for receiving an output signal of a pressure sensor 14 provided on a drawing rod 13 and measuring change with time of the internal pressure of the preform 12 on each pressure set in the pressure controlling device 3 and an operating device 2 for setting the optimum pressure for performing an aimed molding by simulating change with time of the pressure in the preform 12 and comparing the result with the measured result and grasping the relation of factors for dominating deformation of the preform 12 with the pressure set in the pressure controlling device 3, is provided. |
