Molds & Tooling
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Correlation between silver streaks on the surface of PETG products and gate position
Problem Phenomenon
Silver streaks are concentrated near the gate and spread toward the middle of the product.
Cause Analysis
The shear heat at the gate is the highest and the water vaporizes most violently, and shear-induced degradation occurs in the gate area.
Solution
Appropriately reduce the injection speed in the gate area; fully dry; optimize the gate size.
Key Takeaway
PETG gate area silver streaks point to shear and moisture.
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