Injection Molding
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PBT Gate Design Specification
Problem Phenomenon
Defects of PBT products concentrate near the gate, and an overly small pin gate causes filling and jetting problems
Cause Analysis
PBT has good fluidity and needs a larger gate to match high-speed injection: pin gate diameter 1.5mm or more, other gates 0.8mm or more, gate diameter taken as 0.8-1.0 times the wall thickness
Solution
①Pin gate diameter ≥1.5mm, other gates ≥0.8mm; ②Gate size designed according to 0.8-1.0t; ③Gate position avoids stress-bearing areas
Key Takeaway
PBT gate design takes large size matched with high speed as the principle; the 0.8-1.0t empirical formula is the benchmark for mold design; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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