Injection Molding
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Tiger skin pattern on PU surface
Problem Phenomenon
Tiger skin pattern on PU injection molded product surface, alternating light and dark stripes 2-5mm wide
Cause Analysis
Unstable injection speed, melt front fluctuating fast and slow; mold temperature too low <30°C, front cools rapidly
Solution
1) Multi-stage injection slow-fast-slow to stabilize the front; 2) Increase mold temperature to 40-50°C; 3) Increase injection pressure for stable advancement
Key Takeaway
Tiger skin pattern is caused by unstable injection front; multi-stage injection and high mold temperature are key
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