Thermoforming
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Brittleness of PET sheet thermoformed products
Fenómeno do problema
PET thermoformed food trays are brittle, break when bent, and have poor toughness.
Análise das causas
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.
Solução
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.
Conclusão principal
The brittleness of PET thermoformed products is related to excessive crystallization and material degradation.
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