Molds & Tooling
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HDPE pipe plasticization temperature too high
Problem Phenomenon
The pipe surface is yellow and brittle with degradation streaks, and the measured barrel temperature exceeds the process window.
Cause Analysis
Process setting too high, excessive mold core heating with untimely ventilation cooling; excessive screw shear heat is also a common cause, and old worn screws generate more obvious shear heat.
Solution
①Adjust the process temperature setting; ②lower the mold core heating temperature and ventilate and cool the mold; ③replace the screw when shear heat is too high; ④measure the actual melt temperature to calibrate the thermocouple.
Key Takeaway
Out-of-control plasticization temperature damages both appearance and mechanical properties; investigate along three paths of temperature setting, mold core cooling, and screw condition, with the measured melt temperature as the criterion.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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