Injection Molding
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PBT High-Speed Medium-Pressure Medium-Temperature Molding
Problem Phenomenon
Producing PBT with the conventional low-pressure slow-speed process results in insufficient filling of thin-walled parts and obvious weld lines
Cause Analysis
PBT crystallizes fast and solidifies fast, and is suitable for high-speed, medium-pressure, medium-temperature molding conditions; slow filling causes the flow front to solidify prematurely; fast injection matched with its fast crystallization characteristic obtains good molding
Solution
①Adopt high-speed injection matched with medium pressure and medium temperature; ②Enlarge the gate to accommodate fast filling; ③Shorten the holding pressure time to match fast solidification; after adjustment, take samples continuously to verify the effect, and resume mass production only after confirming stability
Key Takeaway
High speed, medium pressure, and medium temperature is the classic process combination for PBT; fast-crystallizing materials need fast filling to match; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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