Molds & Tooling
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EVOH Length Out of Tolerance
Problem Phenomenon
EVOH product length deviation >±0.5mm, out of tolerance
Cause Analysis
EVOH shrinkage unstable fluctuating ±0.5%; mold dimension design did not consider shrinkage compensation; cooling insufficient, dimensions not stabilized
Solution
1) Precisely measure EVOH shrinkage and compensate the mold; 2) Fully cool to ensure dimensional stability; 3) Annealing to eliminate post-shrinkage
Key Takeaway
Length out of tolerance is caused by unstable shrinkage; precise shrinkage compensation is key
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