Material Drying
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PMMA Silver Streaks (Gas Streaks)
Problem Phenomenon
Silver streaks on the product surface, mostly occurring near the gate.
Cause Analysis
Vaporized moisture or volatiles follow the melt filling and leave streaks on the surface; insufficient drying, excessive melt temperature decomposition, and poor venting all induce them.
Solution
①Strengthen drying; ②Lower the melt temperature; ③Increase back pressure for venting; ④Improve mold venting.
Key Takeaway
Silver streaks = check three: moisture + decomposition + venting.
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