Meaning
Point in the injection cycle where the machine shifts from velocity-controlled filling to pressure-controlled holding when the system reaches its maximum designated cavity pressure is defined by this term. A peak pressure switchover prevents the mould from being overfilled, protecting the tool from excessive mechanical stress. When this transition occurs too late, the melt causes tool deflection and plastic flashing.
This transition point is set using sensor feedback, limiting it to processes that feature active cavity monitoring.
Process Transition
High-speed filling ends and the packing phase begins as the polymer melt front reaches the end of the flow path. Utilizing a peak pressure switchover relies on data from sensors embedded within the mould. Once the threshold is detected, the screw slows down to maintain packing pressure, compensating for resin shrinkage.
Equipment Protection
Limiting the pressure during the final moments of the fill cycle protects the delicate steel cores of the mould from bending. The peak pressure switchover acts as a safeguard against machine operator errors or sudden changes in resin viscosity. If a cold slug of polymer blocks the nozzle, the resulting spike triggers the switchover immediately, preventing catastrophic mold damage.
This mechanical protection extends the overall lifetime of the mould and reduces the frequency of maintenance shutdowns.
Quality Output
Achieving consistent part dimensions requires precise control over the volume of plastic injected into each cavity. The peak pressure switchover minimizes the weight fluctuations that typically occur when using variable batches of regrind material. When this transition is executed reliably, the parts exhibit uniform shrinkage and high surface fidelity.
This consistency is necessary for high-precision components such as medical syringes or gears where dimensional deviation can cause assembly failures and result in costly quality audits.
