Material Drying
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Performance decline from PPO regrind use
Problem Phenomenon
After PPO is blended with recycled runner material, the product shows increased cracking tendency and decreased surface quality; the higher the regrind ratio, the more obvious the problem.
Cause Analysis
Although PPO regrind can be reused and the performance does not decrease significantly within generally 3 times, degraded old material greatly increases the cracking risk; insufficiently dried crushed material mixes in moisture; uncontrolled ratio accumulates heat history.
Solution
①Control the number of regrind uses within 3 times; ②the blending ratio should not be too high and should be recorded and traced; ③re-dry the regrind before use; ④reduce or prohibit regrind in key load-bearing parts.
Key Takeaway
The 3-time life of PPO regrind is determined by the material characteristics; traceability management prevents over-use; the cracking risk is positively correlated with the regrind ratio.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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