Extrusion & Post
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PPO Cross-Contamination
Problembeschreibung
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.
Ursachenanalyse
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.
Lösung
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.
Wichtigste Erkenntnis
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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