Molds & Tooling
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Product shrinkage rate high and fluctuating
Problem Phenomenon
Large dimensional deviations, with shrinkage rate fluctuating irregularly between 1.2-1.8%
Cause Analysis
Inconsistent cooling rates in different areas cause crystallinity differences; mold temperature fluctuations cause shrinkage rate changes; inconsistent holding switchover timing
Solution
Stabilize the mold temperature at 180-200°C±2°C; finely adjust the holding switchover point and holding pressure curve; ensure sufficient cooling time
Key Takeaway
PEEK shrinkage rate is highly sensitive to mold temperature and cooling rate
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