Material Analysis
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PET melt temperature 280℃ upper limit
Problem Phenomenon
After the melt temperature becomes high, PET discolors and decomposes, the sheet turns yellow, and the products become brittle
Cause Analysis
PET melt begins thermal decomposition and discoloration once it exceeds 280℃; the high-temperature narrow-window characteristic requires precise temperature control, and shear heat superimposed on the set temperature easily makes the actual melt temperature quietly exceed the standard
Solution
①Control the melt temperature below 280℃; ②control the barrel temperature in zones to avoid local overheating; ③keep the residence time as short as possible and empty the barrel during shutdown; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
280℃ is the thermal decomposition red line of PET melt; dual management of temperature and residence time is the basic skill for preventing discoloration and degradation; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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