Injection Molding
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Tiger skin patterns on product surface
Problem Phenomenon
The surface shows regular or irregular tiger skin-like textures
Cause Analysis
Melt flow in the cavity is unstable (elastic turbulence); the injection speed curve fluctuates; improper gate design causes a transition from jetting to laminar flow
Solution
Optimize the multi-stage injection speed control curve; use appropriate gate type and size; increase mold temperature to slow melt cooling
Key Takeaway
Tiger skin patterns are a macroscopic manifestation of flow instability
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