Material Analysis
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High density of PET extruded foamed sheet
Problem Phenomenon
PET foamed sheet density higher than target value (e.g., >0.5g/cm³), unsatisfactory weight reduction effect.
Cause Analysis
Insufficient foaming agent addition or incomplete decomposition, foaming temperature too low with insufficient gas expansion, insufficient melt strength with gas escaping.
Solution
Increase foaming agent dosage or switch to high-efficiency foaming agent; increase foaming temperature; use chain extenders to increase melt strength; optimize the die head.
Key Takeaway
PET foaming density control requires synergy of melt strength, foaming agent, and process.
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