Molds & Tooling
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PARA Abnormal Shrinkage
Problem Phenomenon
PARA product shrinkage does not match expectations; low-temperature mold molding has lower shrinkage but poor performance.
Cause Analysis
When PARA mold temperature is below 120°C, shrinkage is lower; but accompanied by other performance defects; relationship between crystallinity and shrinkage; wrong mold design compensation basis.; during on-site troubleshooting, verify item by item according to this mechanism, avoiding blind machine adjustment based only on experience
Solution
①Mold temperature ≥120°C to obtain normal shrinkage; ②Mold design according to correct shrinkage; ③Balance performance and shrinkage; ④Actual measurement verification.; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
The temperature dependence of PARA shrinkage must be understood; low shrinkage does not equal high quality; the design basis must be accurate.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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