Injection Molding
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EVA surface tiger-skin pattern
Problem Phenomenon
EVA injection molded product surface has tiger-skin pattern with alternating light and dark stripes 2-5mm wide
Cause Analysis
Unstable injection speed with melt front fluctuating fast and slow; mold temperature too low <30°C with the front cooling 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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