Extrusion & Post
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PPO Cross-Contamination
Problem Phenomenon
After the PPO production line switches materials, black specks, delamination and abnormal performance appear, and residues of the previous material are difficult to remove completely.
Cause Analysis
The high-temperature PPO process causes residues of the previous low-temperature material to rapidly degrade and carbonize; cross-contamination with other materials or impurities affects quality; the shared conveying system mixes in foreign matter.
Solution
①Use dedicated containers and conveying tools for PPO; ②thoroughly clean the barrel when changing materials; ③avoid mixed storage with other materials; ④strengthen inspection of the first batch after switching.
Key Takeaway
PPO cleanliness management extends to the storage and conveying links; dedicated tools are low-cost mistake-proofing; the cost of cross-contamination far exceeds the management cost.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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