Material Drying
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moisture in MP processing causing silver streaks
Problem Phenomenon
MP injection molded product surface shows white silver streak marks
Cause Analysis
raw material moisture >0.05% vaporizes in high-temperature processing, forming bubbles stretched into silver streaks; insufficient drying or condensed moisture in the hopper
Solution
1) dry raw material at 80°C for 3-4h to moisture <0.02%; 2) increase back pressure 0.5-1MPa for venting; 3) reduce injection speed to avoid air entrapment; 4) heat the hopper to prevent condensed moisture
Key Takeaway
silver streaks are caused by moisture vaporization and stretching; drying and venting are the main countermeasures
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