Material Drying
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PSU Insufficient Drying Causing Silver Streaks and Bubbles
Problem Phenomenon
Water ripples, bubbles, silver streaks and material streaks appear on the surface of PSU products; defects are highly visible on transparent parts, accompanied by a decline in mechanical properties.
Cause Analysis
Although PSU has an equilibrium water absorption of only 0.6% and no hydrophilic groups, trace moisture causes melt degradation under high temperatures above 280°C and strong mechanical forces; moisture exceeding 0.05% produces obvious defects.
Solution
①Fully dry at 120~135°C for 4~5 hours before '2079851475616104452; ②Verify that the moisture content meets the standard; ③Seal and store after drying to prevent moisture regain; ④When silver streaks appear, measure moisture first before checking other factors.
Key Takeaway
The destructive power of trace moisture in PSU is amplified at high temperatures; drying verification is the first gate for transparent part quality; appearance defects and performance decline often share the same source.; After confirming effectiveness, solidify the parameters and practices into the work instructions to prevent recurrence
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