Material Analysis
9 views
Unstable shrinkage of PU
Problem Phenomenon
Shrinkage of PU products fluctuates ±0.8%, exceeding the ±0.2% requirement
Cause Analysis
Molecular weight differences between PU batches cause shrinkage variation; processing temperature fluctuation affects crystallinity and thus shrinkage
Solution
1) Strictly control raw material batch consistency; 2) Stabilize processing temperature ±2°C to ensure consistent crystallinity; 3) Reserve adjustment space for mold shrinkage compensation
Key Takeaway
Unstable shrinkage is caused by batch differences and temperature fluctuation; raw material and temperature control are key
Was this helpful?
0 people found this helpful
Thank you for your feedback!