Material Drying
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PMMA Silver Streaks (Gas Streaks)
Fenómeno del problema
Silver streaks on the product surface, mostly occurring near the gate.
Análisis de la causa
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.
Solución
①Strengthen drying; ②Lower the melt temperature; ③Increase back pressure for venting; ④Improve mold venting.
Conclusión clave
Silver streaks = check three: moisture + decomposition + venting.
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