Processing Machinery
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PP Recycled Material Ratio
Problem Phenomenon
[Problem Phenomenon] PP recycled material ratio out of control, strength and color hue decline
Cause Analysis
PP recycled material's repeated thermal history reduces molecular weight; an out-of-control ratio causes dual decline in strength and color hue; generally ≤20-30% and dried separately; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based on experience alone
Solution
Regrind ≤20-30%; handle separately; limit use in performance parts; prohibit in color-sensitive parts; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PP recycled material is capped at 20-30%, use cautiously in performance and color parts; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for similar future problems
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