Injection Molding
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Linear marks appear around multiple gates or holes of the product
Problem Phenomenon
Linear marks appear around multiple gates or holes of the product, strength significantly lower than normal areas, color at the weld line differs from the surroundings
Cause Analysis
Before confluence of melt from multiple gates, temperature has dropped, poor fusion
Injection speed on the low side, insufficient melt front temperature
Insufficient mold venting, gas at the weld hinders fusion
Melt flow path too long, large temperature drop
Excessive lubricant reducing melt adhesion
Solution
Increase injection speed to keep the melt front at high temperature
Appropriately raise barrel temperature to the high side of 170-230°C
Add vent grooves or overflow wells at the weld line
Shorten the flow path or adjust gate position
Reduce lubricant addition
Key Takeaway
Weld lines require increasing confluence temperature, improving venting and optimizing gates
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