Material Drying
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PC/ABS Blend Silver Streaks
Problem Phenomenon
PC/ABS products have silver streaks near the gate, still occurring occasionally after drying, harder to eradicate than ordinary ABS.
Cause Analysis
PC/ABS is sensitive to moisture and the ABS component easily carries volatiles; insufficient drying, too high melt temperature, or unstable flow can all trigger it; the superposition of the processing characteristics of the two components makes the window narrower.
Solution
①Fully dry at 80~100°C for several hours and verify dryer performance; ②Appropriately reduce the melt temperature when it is too high; ③Control the regrind ratio; ④Stabilize injection speed to avoid flow fluctuations; ⑤Open or clean vent slots at the corresponding positions to ensure smooth gas discharge.
Key Takeaway
PC/ABS silver streaks = three things: 'drying + temperature + regrind': the PC component needs drying, the ABS component needs temperature control, and regrind needs a limited ratio; the processing window of blends is narrower than that of single materials, and management must be more detailed.
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