Molds & Tooling
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Uneven PET hot runner temperature
Problem Phenomenon
In multi-cavity preforms, some cavities turn white and some have high AA, with obvious quality differences among cavities, and cavity-by-cavity testing confirms the temperature deviation.
Cause Analysis
Aging of the hot runner heater bands, inaccurate thermocouples, or temperature controller failure make the actual temperature of each gate inconsistent; cavities with high temperature degrade heavily, and cavities with low temperature fill poorly.
Solution
①Calibrate the hot runner temperature point by point and replace failed elements; ②calibrate the thermocouples and temperature controllers; ③test the quality indicators of preforms from each cavity separately; ④establish a hot runner inspection system.
Key Takeaway
Hot runner temperature uniformity determines multi-cavity consistency; tracking quality data by cavity can quickly locate the problem gate and is the standard management method for preform production.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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