Molds & Tooling
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PBT flowability sudden change above melting point
Problem Phenomenon
After the temperature rises above the melting point, flowability suddenly increases, and flash and drooling suddenly intensify
Cause Analysis
PBT has a clear melting point, and flowability increases sharply when the temperature rises above the melting point; this sudden change characteristic requires precise temperature setting, and requires vigilance against mold flash and nozzle drooling
Solution
①Set temperature considering the melting point sudden change characteristic; ②improve mold mating surface precision to prevent flash; ③control nozzle temperature to prevent drooling; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PBT's melting point sudden change is its process characteristic; the sharp increase in flowability is both an advantage for thin-wall filling and a risk of flash and drooling; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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