Material Drying
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PA6 Over-Drying Risk
Problem Phenomenon
After the moisture content of the pellets drops below 0.06%, the melt flowability worsens instead, and the product surface gloss is poor
Cause Analysis
Over-drying increases PA6 melt viscosity, reduces flowability, and affects surface quality; the drying process is also an annealing process, and 90°C × 8h raises crystallinity, widens the melting range, and makes plasticization difficult
Solution
①Control the moisture content in the optimal range of 0.08-0.18%, do not blindly pursue the lower the better; ②choose vacuum drying at 80°C × 6h to balance moisture content and crystallinity; ③dew point control to prevent over-drying
Key Takeaway
PA6 drying has an optimal range rather than the drier the better; 0.08-0.18% balances preventing silver streaks with maintaining flowability, and over-drying likewise produces defects; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence
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