Injection Molding
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Wave-like lines appear on the product surface
Problem Phenomenon
Wave-like lines appear on the product surface, periodically distributed along the flow direction, affecting appearance and feel
Cause Analysis
Unstable injection speed causes melt front fluctuation
Improper gate type produces turbulence
Mold temperature too low (below the lower limit of 40-80°C), the melt front cools quickly
Improper holding pressure switchover timing
Raw material fluidity fluctuation
Solution
Stabilize injection speed, avoid sudden fast and slow
Change the gate type, e.g., from pin gate to fan gate
Appropriately increase the mold temperature to the 40-80°C range
Optimize the holding pressure switchover point
Ensure the raw materials are uniformly mixed
Key Takeaway
Surface waviness requires stable injection speed and mold temperature
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