Processing Machinery
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Embrittlement from PP regrind blending
Problem Phenomenon
After blending regrind, the impact strength of the product decreases, and bending locations break easily.
Cause Analysis
The regrind has undergone multiple heat histories and its molecular weight has degraded; impurities mixed into the regrind also become fracture initiation points.; during on-site investigation, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience
Solution
①Control the regrind blending ratio; ②manage regrind by classification; ③test the impact performance after blending; ④restrict regrind in load-bearing parts.; after adjustment, continuously sample and verify the effect, and resume mass production after confirming stability
Key Takeaway
The accumulated degradation of PP regrind directly affects toughness; ratio control and performance verification are the bottom line.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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