Injection Molding
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PMMA Flash and Burrs
Problem Phenomenon
Flash on product edges; burrs on transparent part edges affect assembly and appearance
Cause Analysis
Although PMMA has poor flowability, it requires high injection pressure; when clamping is insufficient or the mold is worn, high-pressure melt seeps into parting line micro-gaps and forms flash; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①Calculate clamping force according to the high-pressure process with margin; ②regularly repair and grind the parting line to restore fit; ③injection pressure sufficient is enough, not excessive; after adjustment, take samples continuously to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PMMA flash is a side effect of the high-pressure process; clamping calculation and mold maintenance are the defense lines; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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