Processing Machinery
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PMMA Weld Line Visible
Problem Phenomenon
Weld lines on transparent parts are clearly visible, optical appearance is unqualified, and machine adjustment is difficult to eliminate them
Cause Analysis
PMMA has poor flowability, and the interface is clear when two melt fronts converge; weld lines on optical parts form even with correct parameters and must be minimized by design and low-speed processes
Solution
①Slow injection for optical parts to reduce weld line visibility; ②position gates to move weld lines out of visible areas; ③switch to single-gate filling when necessary; after adjustment, take samples continuously to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Weld lines on PMMA optical parts can only be minimized, not eliminated; design position transfer is more effective than process remedies; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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