Molding Process
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Uneven solid-state polycondensation of PET chips
Problem Phenomenon
After solid-state polycondensation (SSP) of PET chips, the IV value distribution is wide, and some chips have low IV.
Cause Analysis
Temperature distribution in the solid-state polycondensation reactor is uneven; uneven chip particle size causes reaction rate differences; gas flow distribution is uneven.
Solution
Optimize reactor design and temperature control; sieve to control particle size deviation to ±10%; optimize gas flow distribution; precisely control reaction time.
Key Takeaway
PET solid-state polycondensation uniformity is key to bottle-grade chip quality.
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