Molds & Tooling
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PMMA Light Guide Plate Warpage
Problem Phenomenon
Thin-wall light guide plates warp after demolding, dot replication is incomplete, and light leakage is uneven after assembly.
Cause Analysis
Thin-wall long-flow-path filling requires high pressure and creates large internal stress; uneven mold temperature and improper holding pressure cause inconsistent shrinkage, making optical-grade flatness hard to guarantee.; During on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based on experience alone.
Solution
①Improve mold temperature uniformity; ②optimize holding pressure profile; ③multi-point gates for balanced filling; ④anneal to reduce stress.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Key Takeaway
Light guide plates are a high-difficulty category of PMMA '2079851475616104452; stress and flatness control is the core, and process and mold need synchronized fine design.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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