Meaning
Latency represents the time interval between the introduction of an electronic pulse to a sensor and the registration of an output command in a digital controller. This signal processing delay occurs when internal circuits perform filtering or analog to digital conversions. It limits the response speed of automated injection moulding machinery.
The interval varies based on the sampling frequency of the control logic.
Injection Timing
Rapid pressure cycles require precise synchronization between the screw movement and the hydraulic valves. Signal processing delay forces engineers to program an offset into the machine controller to ensure the switch from fill to pack happens at the correct cavity volume. High frequency fluctuations in the power supply might increase this gap unexpectedly.
Parts produced with inconsistent timing often exhibit dimensional instability or flashing due to overpacking.
Resin Throughput
Thermoplastic materials behave according to their thermal mass and viscosity curves during the melt phase. Signal processing delay affects the sensor feedback loop used to maintain consistent melt temperatures in the barrel. Proper calibration of the thermal probes reduces the risk of burning heat sensitive resins like PVC during long cycles.
Variations in the cooling time arise when the controller relies on outdated data from slow internal processing.
Sensor Integrity
Digital signals provide the basis for all closed loop control in modern manufacturing. A signal processing delay exceeding the cycle time causes the system to hunt for the correct position, leading to wasted energy and rejected shots. Manufacturers monitor the drift in these values to determine when a circuit board requires replacement or recalibration.
Consistent performance across the entire production run depends on the reliability of the software routines governing the hardware output.
