Extrusion & Post
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Snake-like curved lines appear on the product from the gate
Problem Phenomenon
Snake-like curved lines appear on the product from the gate, the melt advances in a snake-like winding manner, the surface is rough and irregular
Cause Analysis
Injection speed too fast, the melt produces jetting when passing through the gate
Gate size and cavity ratio improper
Gate position faces an open cavity
Melt temperature too low, high viscosity, severe shear when passing through the gate
Insufficient mold venting
Solution
Reduce the initial injection speed, adopt slow-fast-slow mode
Increase gate size to reduce shear
Change the gate position to side feed to avoid facing the open cavity directly
Appropriately increase the melt temperature to 170-230°C
Improve mold venting
Key Takeaway
Jetting requires reducing the initial injection speed and adjusting the gate
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