Thermoforming
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Brittleness of PET sheet thermoformed products
Problem Phenomenon
PET thermoformed food trays are brittle, break when bent, and have poor toughness.
Cause Analysis
Excessive crystallization during sheet heating (staying too long in the crystallization temperature zone); improper forming temperature; sheet IV is on the low side with too much recycled material.
Solution
Heat quickly to shorten the stay in the crystallization temperature zone; forming temperature 100-120°C; use sheet with IV≥0.70; fully dry before forming.
Key Takeaway
The brittleness of PET thermoformed products is related to excessive crystallization and material degradation.
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