Molds & Tooling
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PMMA Product Ejection Whitening and Puncture
Problem Phenomenon
Thin-wall transparent parts are ejection-whitened or even punctured during ejection.
Cause Analysis
Insufficient cooling gives low ejection strength, or large shrink-fit force makes local ejector pin pressure exceed the limit; ejection whitening on transparent parts cannot be concealed and they are directly scrapped.; During on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based on experience alone.
Solution
①Extend cooling; ②increase ejection area to balance force; ③raise mold temperature to reduce shrink-fit; ④optimize ejector pin layout.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Key Takeaway
The ejection system for transparent parts must be designed to a higher standard; zero tolerance for ejection whitening, and both ejection balance and sufficient cooling are indispensable.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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