Material Analysis
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Exudate from PET bottle cap liners
Problem Phenomenon
Oily or powdery substances exude from the liner inside the PET bottle cap, contaminating the contents.
Cause Analysis
Small-molecule additives (plasticizers, slip agents, etc.) in the liner material migrate and exude; the liner material is not resistant to the contents.
Solution
Select liner material formulations with low migration; control the type and dosage of additives; conduct accelerated migration tests for verification.
Key Takeaway
PET bottle cap liner exudation is a strictly controlled issue in food packaging.
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