Material Drying
2 views
Glass Fibre moisture during processing causes silver streaks
Problem Phenomenon
Glass Fibre injection molded product surface shows white silver streak marks
Cause Analysis
Raw material moisture >0.05% vaporizes during high-temperature processing forming bubbles stretched into silver streaks; insufficient drying or condensed water vapor in hopper
Solution
1) Dry raw material at 80°C for 3-4h to moisture <0.02%; 2) raise back pressure 0.5-1MPa for venting; 3) reduce injection speed to avoid air entrainment; 4) heat hopper to prevent condensed water vapor
Key Takeaway
Silver streaks are caused by moisture vaporization and stretching; drying and venting are the main countermeasures
Was this helpful?
0 people found this helpful
Thank you for your feedback!