Material Drying
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ASA hygroscopic characteristics and drying necessity
Problem Phenomenon
[Problem phenomenon] ASA product surface silver streaks and bubbles, mistakenly believing low hygroscopicity allows skipping drying for direct production
Cause Analysis
Although ASA has slightly lower hygroscopicity than ABS, it is still a hygroscopic material; moisture adsorbed on the pellet surface vaporizes during processing at 230-260°C; Plasthub clearly states ASA hygroscopicity requires light drying at 80°C×2-4h, otherwise residual moisture causes silver streaks
Solution
Dry at 80°C×2-4h before molding; in humid environments or long-opened bags, extend to 4h; desiccant dryer dew point below -30°C guarantees the endpoint; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
ASA light hygroscopicity is not a reason to skip drying, 80°C×2-4h is the silver streak defense line; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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