Injection Molding
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PVC Gate and Runner Enlargement
Problem Phenomenon
Complex structural parts were underfilled, and after increasing injection pressure the gate area was burnt instead
Cause Analysis
PVC's high viscosity causes high flow resistance; small gates and thin runners both restrict filling and generate shear heat; gates and runners must be enlarged compared with conventional plastics to balance filling and degradation prevention
Solution
①Enlarge gate and runner dimensions compared with conventional ones; ②use high-flow grades for complex parts; ③optimize injection pressure in coordination with gate size; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
Bigger is better for PVC's gating system; enlargement to reduce shear is the common solution for filling and degradation prevention; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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