Processing Machinery
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PBT melt temperature 250-270℃
Problem Phenomenon
Low melt temperature causes poor plasticization and insufficient filling, while exceeding 275℃ causes material decomposition and embrittlement
Cause Analysis
PBT melting point is about 225℃, molding temperature 250-270℃; barrel temperature exceeding 275℃ or melt residence exceeding 30 minutes causes decomposition and embrittlement; the temperature window is narrow and sensitive to residence
Solution
①Set melt temperature at 250-270℃; ②strictly prohibit exceeding 275℃; ③melt residence in the barrel not exceeding 30 minutes; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PBT's 275℃ and 30 minutes are two hard red lines; combined management of temperature and residence time is the core of degradation prevention; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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