Material Drying
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PARA Insufficient Drying Defects
Problem Phenomenon
PARA products show silver streaks, bubbles and mechanical property decline; raw material opened for more than 24 hours is produced without drying.
Cause Analysis
Although PARA has low moisture absorption, the polyamide groups still absorb moisture; after the sealed package is opened for 24 hours, drying according to the specification is required; moisture vaporizes in the 280°C melt and causes degradation; desiccant drying dew point -28°C or lower.
Solution
①Can be used directly within 24 hours of opening; ②After timeout, desiccant drying at 120°C×0.5~1.5 hours or 100°C×1~3 hours or 80°C×1~7 hours; ③Dew point -28°C verification; ④Seal and store after drying.
Key Takeaway
PARA's 24-hour opening rule is an explicit supplier specification; multi-temperature drying options provide flexibility; dew point verification is the drying quality assurance.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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