Extrusion & Post
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GPPS Product Silver Streaks
Problem Phenomenon
Silver streaks distributed along the flow direction on the product surface.
Cause Analysis
Water contained in the pellets or degradation gas is stretched into streaks during filling; shear overheating also produces similar streaks.; during on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience
Solution
①Fully dry the pellets; ②lower barrel temperature; ③reduce screw speed and back pressure; ④clean the barrel to remove degraded material.; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Silver streaks distinguish two sources: moisture and degradation; if drying is ineffective, turn to temperature troubleshooting.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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