I. The consistency of the filling meets the established standards.
There are no instances of insufficient material or overflow in localised cavities. The filling time difference between cavities for multi-cavity moulds is ≤0.1s, and the filling length deviation between cavities for short-shot samples is ≤2%.
The weight fluctuation of products from 20 consecutive moulds is ≤±0.5%, indicating highly stable filling. The coefficient of variation (CV) for product weight in each cavity is ≤1.3%.
II. The Dimensions and Appearance of the Product are Valid
Shrinkage marks, flash, scorching, obvious weld lines, and other appearance defects are absent from the product surface. Gate marks are ≤0.3mm, and there is no discernible shearing whitening.
The dimensional fluctuation of products from 50 consecutive moulds is ≤±0.02mm, with no dimensional drift, and all key product dimensions are within the drawing tolerances.
III. Stable Process Window: The product remains qualified when core parameters (injection speed, holding pressure, mould temperature) fluctuate slightly within ±10%, indicating satisfactory process tolerance.
The injection pressure curve and in-mold pressure curve, which were captured in real time by the injection moulding machine, exhibit a ≥95% overlap over 10 consecutive moulds, with no abnormal jumps.
II. Production Efficiency Exceeds Standards
III. The production capacity reaches the preset target, and the moulding cycle time remains stable at the optimised shortest duration, without any superfluous cooling or pressure holding redundancy.
To rapidly re-establish stable production after altering production lines or materials, only minor parameter adjustments within ±5% are required, eliminating the necessity for extensive machine readjustment.
V. Consistent Mass Production Conditions
A product yield rate of ≥98% and a continuous and stable mass production operation for 4 hours, with no batch defects produced throughout the process.
The equipment is not exhibiting any abnormal overload or over-temperature alarms, and the temperature fluctuation in each zone of the hot runner is ≤±0.5℃, indicating that there is no danger of process drift.
The precision hot runner multi-cavity mould injection moulding production line that you are currently maintaining is fully compatible with this set of judgement standards. A full-dimensional verification on-site can be completed rapidly by ordinary maintenance engineers to confirm that the parameters have been adjusted correctly.
