Material Drying
3 조회수
Performance decline from PPO regrind use
문제 현상
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.
원인 분석
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.
해결 방법
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.
핵심 요약
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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