Molding Process
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PPO Purging Material Selection
Problem Phenomenon
【Problem Phenomenon】PPO is not cleaned thoroughly during material change or shutdown, and black speck carbonized material continuously contaminates products
Cause Analysis
SABIC clearly states that polystyrene and crushed cast acrylic are effective purging materials for NORYL, and purging should be performed within the melt temperature range of that grade with ventilation ensured; GTX is purged according to nylon procedures, PPX according to PP procedures
Solution
Purge with PS or cast acrylic within the melt temperature window; alloy grades select purging materials according to their base material procedures; maintain workshop ventilation during purging; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
PPO purging uses PS and acrylic; alloy grades follow the base material procedures; 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 subsequent similar problems
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