Material Drying
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PC/ABS insufficient drying silver streak
Problem Phenomenon
Silver-white streaks appear on the part surface, distributed in a U-shaped fan near the gate.
Cause Analysis
PC/ABS is highly hygroscopic; when the moisture content exceeds the standard, the moisture vaporizes into steam during '2079851475616104452 and is sheared at the gate to form U-shaped silver streaks; incomplete drying is the most common cause of silver streaks.
Solution
①Dehumidification drying at 100~110℃ for 3~4 hours; ②reduce moisture content to below 0.02%; ③check the dryer dew point and motor rotation direction to confirm real drying; ④sealed conveying after drying.
Key Takeaway
90% of PC/ABS silver streaks originate from drying; do not judge dryness by the appearance of the pellets, the moisture content must be measured before adjusting the machine.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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