7. Pressure and temperature sensors

7.1 Possibilities and limits

The pressure sensor is generally a piezoelectric sensor. It can be placed on the ejector plate. In this case, it measures the injection and holding pressure at the point where the ejector emerges from the cavity, as well as the ejection force. The design of the sensor must enable it to withstand the shocks and vibrations associated with its position in the ejector plate.

The pressure sensor can be positioned at any point in the cavity. An increase in pressure indicates the arrival of the material front: this makes it possible to check that a part has been correctly filled, if the sensor is positioned at the end of the filling process. Measuring the pressure cycle at a single point enables you to check that the process is running...