Plastics - 100 % Quality Injection Molding - KISTLER - #29

Text version of the page

www.kistler.com 29 Measurement of the tie bar extension involves the installation of Type 9827A… sensors directly into the drilled holes in the tie bar. They transmit a signal which is proportional to the force during mold movement and clamp force. Measuring the tie bar extension Type 4013B... Type 9827A... Equipping all tie bars with a sensor allows the measurement of forces on the individual tie bars to ensure parallelism of the mold platens and the mold itself, detection of overloads in individual tie bars and the active prevention of cracks in the tie bars. The charge amplifier required for this application is included in the Type 9827A... measuring chain. Measuring the Clamping Force, Tie Bar Extension and Melt Pressure In view of recent developments in the area of electric injection molding machines, the measurement of the melt pressure has become increasingly important, as classic control parameters such as the hydraulic pressure are no longer available. As measurement sensors recording the current consumption or the torque are located at a distance from the mold, they are not as suitable for accurate control functions as the direct measurement of the melt pressure in the area in front of the screw. The Type 4013B… sensors provide fast highprecision measurement, which meets all requirements of electric injection molding machines. Measuring the melt pressure The piezoresistive sensors, which can be used for pressures of up to 3 000 bar and temperatures of up to 350 °C, deliver detailed process information and are also suitable for process monitoring with hydraulic machines. Further areas of application for these sensors include pressure measurement in hot-runner systems. In addition to pressure monitoring in the hot-runner, the acquired information can be used for control purposes. The sensor can be equipped with a temperature measurement feature for a precise determination of the melt temperature directly on the sensor's measuring component.