Molds & Tooling
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PP Part Surface Ripple (Flow Mark)
Problem Phenomenon
Concentric circular ripples around the gate.
Cause Analysis
Unstable front advance speed and uneven front cooling; low mold temperature and unreasonable speed profile.
Solution
①Optimize the speed profile; ②raise mold and melt temperature; ③enlarge the gate; ④check hot runner temperature control.
Key Takeaway
Ripple = disordered front rhythm—smooth out the speed profile.
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