Material Drying
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Combined Causes of PSU Silver Streaks and Bubbles
Problem Phenomenon
Silver streaks and bubbles appear simultaneously on PSU products; simply strengthening drying does not completely improve, and defects still occur intermittently.
Cause Analysis
Raw material not fully dried with high moisture; melt temperature too high causing overheating decomposition and gas generation; poor mold venting causing air retention; injection speed too fast entraining air; multiple factors superimposed.
Solution
①Fully pre-dry the raw material; ②Appropriately lower barrel temperature; ③Add vent holes or vent grooves to improve venting; ④Appropriately slow down injection speed.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
The multi-factor superposition characteristic of PSU silver streaks and bubbles requires systematic troubleshooting; verify drying, temperature, venting, and speed item by item; a single measure is difficult to cure.; After confirming effectiveness, solidify the parameters and practices into the work instructions to prevent recurrence
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