Molds & Tooling
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PMMA Flow Marks
Problem Phenomenon
Wavy flow marks on the transparent part surface, poor appearance.
Cause Analysis
Fast front cooling or unstable speed; low mold temperature, poor gate position; transparent parts magnify tiny flow marks.
Solution
①Raise the mold temperature to 70~90℃; ②Optimize the speed curve; ③Keep the gate away from optical surfaces; ④Large gate.
Key Takeaway
Transparent part flow marks = front problems with nowhere to hide.
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