Molds & Tooling
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PMMA Mold Temperature Too Low and High Stress
Problem Phenomenon
Product internal stress tests high, there are many cracking complaints after storage, and mold temperature records show long-term operation at the lower limit.
Cause Analysis
Low mold temperature causes PMMA to cool and set quickly, molecular chains have no time to relax, and residual stress is frozen in the product; low mold temperature also reduces surface gloss and weld line quality.
Solution
①Raise mold temperature to the 70~90℃ range; ②stabilize mold temperature fluctuation; ③combine with annealing treatment; ④verify stress level decrease.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Key Takeaway
Mold temperature is the core parameter of PMMA stress management; high and stable mold temperature can reduce residual stress by 30~60%, and optical and load-bearing parts should be strictly controlled.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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