Sensor Position

Three typical positioning methods are used when measuring mold cavity pressure. The method chosen depends on the geometry and application of the part.

Sensor in first third of flow path
For parts with non-critical flow lengths and wall thicknesses a sensor is positioned in the first third of the flow path. This location allows good process evaluation, because a useful pressure signal is available throughout the entire injection, compression and holding pressure phase. This provides comprehensive information about the variation in mold cavity pressure.

One sensor near gate and one near end of flow
Parts with a large flow path to wall thickness ratio, such as car bumpers, distort as a result of internal stress. The pressure drop in the cavity is therefore measured with two sensors. The first is positioned in the near the gate and the second towards the end of flow. These pressure measurement can also be used to monitor overpacking in the gate area.