Thermoforming
6 مشاهدة
Brittleness of PET sheet thermoformed products
ظاهرة المشكلة
PET thermoformed food trays are brittle, break when bent, and have poor toughness.
تحليل الأسباب
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.
الحل
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.
الخلاصة الأساسية
The brittleness of PET thermoformed products is related to excessive crystallization and material degradation.
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