| 摘要 |
A vibrating member (31) connected to a frequency transmitter (41) produces relative movement between the injection cylinder (21) and the material conveying unit (22). The frequency can be varied within a range which sets up a resonance vibration in the cylinder and conveying unit. An Independent claim is made for a method for influencing the melt flow between the cylinder and conveying unit in which forces applied to the melt effect a transverse movement with a frequency in the ultrasonic range. Preferred Features: The vibrating member (31), which is a piezoelement, is located either between the material conveying unit (22) and power unit (51) or is connected to the injection cylinder (21) which with the injection nozzle is decoupled from the molding tool to prevent vibration transfer. The vibrating member can be located either in a housing (71) or clamped between two flanges. Vibration decoupling can be effected by a sliding ring or a damper. The material conveying unit (22) can be a screw (23) with a sliding contact (43) between the vibrator and frequency transmitter (41) or a screw with a frequency transmitter connected to a coil surrounding the drive rod (52) and magnetically coupled to another coil connected to the vibrator. The material conveying unit may also be a solid or tubular piston. A melt temperature sensor (81) is connected to the frequency transmitter which functions in an ultrasonic range, e.g. 10-40kHz. |
