Material Analysis
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Degradation from Blending Recycled Material into PEEK
Problem Phenomenon
After recycled sprue material is blended into PEEK products, impact strength decreases, brittleness increases, surface quality worsens, and the higher the blending ratio, the more obvious the deterioration.
Cause Analysis
Every heat history of PEEK is accompanied by molecular chain scission and performance decay; after one or more high-temperature processing cycles, recycled material has decreased molecular weight and may be mixed with degraded black specks and contaminating impurities.
Solution
①Control the blending ratio of recycled material and manage the number of uses by grade; ②Re-dry recycled material after grinding; ③Test the melt index change before blending to evaluate the degradation degree; ④Prohibit recycled material for critical load-bearing parts.
Key Takeaway
The core of PEEK recycled material management is controlling the number of heat histories; melt index testing is a practical means to quickly evaluate degradation; high-value products should not bear performance risks to save material.
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