Material Drying
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Performance decline of products after adding PET recycled material
Problem Phenomenon
After adding crushed recycled PET bottle flake, product impact strength decreases by 20-40% and color turns yellow.
Cause Analysis
Recycled material undergoes molecular chain degradation through multiple thermal histories and IV decreases; it is mixed with impurities such as label adhesives; insufficient drying causes hydrolytic degradation.
Solution
Control the recycled material proportion to ≤30%; fully wash to remove impurities; add chain extenders to restore IV; strengthen drying.
Key Takeaway
PET recycling requires controlling the addition proportion and taking quality restoration measures.
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