Injection Molding
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MP surface tiger-skin pattern
Problem Phenomenon
MP injection molded product surface has tiger-skin pattern, alternating light-dark streaks, width 2-5mm
Cause Analysis
injection speed unstable, melt front fluctuates fast and slow; mold temperature low <30°C, front rapidly cools
Solution
1) multi-stage injection slow-fast-slow to stabilize the front; 2) raise mold temperature to 40-50°C; 3) increase injection pressure to stabilize 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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