Material Drying
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Radial silver streaks on product surface
Problem Phenomenon
Silver-white streaks radiating outward from the gate; the product appearance is severely defective
Cause Analysis
The material contains moisture or low-molecular volatiles; excessive temperature in the rear barrel section causes a component to decompose and produce gas; insufficient back pressure fails to squeeze the gas out of the melt
Solution
Strictly dry to moisture <0.05%; reduce the rear barrel section temperature to reduce decomposition; increase back pressure to 5-10MPa to squeeze out gas
Key Takeaway
Silver streaks are a direct manifestation of gas entrained in the melt or decomposition gas
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