I. Rapid Confirmation of Pre-Filling
Perform a brief shot at 70% to 80% of the stroke, ensuring that the cavity number experiencing slow filling is accurately marked and that no other cavities are experiencing synchronous anomalies.
Efficiently determine the actual temperature of the hot runner nozzle in the corresponding cavity, thereby eliminating hardware defects such as nozzle blockage and temperature drift.
II. Prioritise Temperature Control for Efficiency
Elevate the temperature of the hot runner nozzle in the corresponding cavity by 3 to 5 degrees Celsius. In the event that the runner branch is extended, concurrently elevate the temperature of the upstream manifold section by 2 to 3 ℃.
Perform a brief injection to confirm the improvement in filling progress after waiting for 2 to 3 minutes for the temperature to stabilise completely.
III. Acceleration of Targeted Injection Speed
Locate the filling range of the corresponding runner for this cavity in the multi-segment injection speed parameters. Increase the injection speed of that segment by 10% to 20%.
To prevent secondary defects, such as flash and scorching in normal cavities, it is important to refrain from increasing the overall pace throughout the entire process.
IV. Energy Supplementation Through Pressure
To supplement the melt flow driving force and surmount remaining flow resistance, increase the injection pressure corresponding to this filling section by 10% to 15%.
In order to prevent melt degradation and equipment overburden, the overall injection pressure should not exceed 85% of the equipment's rated maximum value.
V. Compensation for Needle Valve Timing (Applicable to Hot Runners for Needle Valve)
To directly compensate for flow lag, advance the opening time of the corresponding needle valve gate by 0.1 to 0.2 seconds. Each adjustment must be managed within a timeframe of 0.05 seconds.
Confirm that the weight deviation of this cavity from other cavities is ≤1.5% and that the parameters are cured after complete filling synchronisation by conducting a continuous production of 20 moulds.
The production scenario of small-batch hot runner multi-cavity moulds is entirely compatible with this repair solution. The adjustment process will not interfere with the normal filling state of other cavities and can quickly achieve full cavity filling synchronisation.
