Injection Molding
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PVC Pipe Fitting '2079851475616104452
Problem Phenomenon
PVC pipe fittings were burnt and discolored at the threads, the scrap rate was as high as 18%, and mold life dropped sharply
Cause Analysis
Complex gate geometry induced operators to raise temperature to improve flow; running above the window at 205-215°C caused every shot to release HCl; the corroded and roughened mold required higher pressure, a vicious cycle
Solution
①Lower barrel temperature to 175-185°C; ②redesign the gate to reduce shear; ③change mold inserts to bimetallic anti-corrosion and add flow stabilizer; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
The temptation to raise temperature for PVC pipe fittings is the biggest process trap; only lowering temperature plus gate optimization plus anti-corrosion can break out of the vicious cycle; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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