Injection Molding
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PBT thin-wall product insufficient flowability
Problem Phenomenon
Filling is difficult when '2079851475616104452 thin-wall PBT products, with short shot at the end.
Cause Analysis
PBT melt viscosity is relatively high, and flow resistance is large in thin-wall long flow paths; low temperature or too small gate further restricts flow.; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①Appropriately increase melt temperature to improve flow; ②select high-flow PBT grades; ③enlarge gate and runner; ④increase injection speed and pressure.; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Thin-wall PBT filling relies on the coordination of temperature, grade and runner; high-flow grades are the structural solution.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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