I. Accuracy Standards for Temperature Control Systems: The hot runner's zones are elevated to their rated operating temperature and maintained for a duration of two hours. The temperature fluctuation in each zone is no more than ±0.5.℃, and the temperature control accuracy is within 0.3%.
All hot nozzles and manifold locations are measured using a temperature monitoring instrument. The temperature difference between zones is ≤ 3℃, the branch filling time difference is ≤ 0.1s, and the hot runner's overall thermal balance meets standards.
II. Accuracy Standards for the Displacement Monitoring System: For all five calibration points across the full range, the deviation between the measured displacement and the Hall displacement sensor output value is ≤ 0.1mm, with no jumps or missing values.
The hot runner is heated to its rated operating temperature and maintained for one hour. The theoretically calculated thermal expansion value is ≤ 0.2mm greater than the measured displacement value, and there is no temperature drift.
The system precisely triggers a light alarm within 1 second and simultaneously outputs an interlocking warning signal when the displacement reaches within ±0.1mm of the preset alarm threshold.
III. Precision Compliance Criteria for the Runner and Mechanical System: The runner balance accuracy meets the standards, and the filling time difference of each cavity is ≤0.1s after short-shot filling trial moulding. Additionally, the filling consistency deviation of multi-cavity moulds is ≤2%.
The positioning ring's coaxiality is ≤0.02mm, and the actual gap between the hot runner plate and the upper mould plate and the designed reserved thermal expansion gap is ≤0.1mm, with no danger of jamming or interference.
IV. Precision Compliance Criteria for Mass Production Conditions: The hot runner system operates continuously and stably in mass production for four hours, with no anomalous fluctuations in core parameters, including temperature, displacement, and filling pressure, during the process.
The gate marks are ≤0.3mm and the product internal stress deformation is ≤±0.02mm, as evidenced by the sampling inspection of injection moulded products. These specifications are consistent with the demands of precision injection moulding production.
The precision injection moulding hot runner system you are currently maintaining is fully compatible with this set of criteria. The heated runner system's long-term stability is guarantyd by the rapid completion of the full-dimensional verification on-site by ordinary maintenance engineers.
