Molding Process
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Large fluctuation of PU impact strength
Problem Phenomenon
PU product impact strength fluctuates ±30%, unstable
Cause Analysis
PU dispersed phase particle size fluctuates 0.2-1μm, causing unstable toughening effect; crystallinity fluctuation affects impact
Solution
1) Stabilize processing conditions to ensure consistent dispersed phase particle size; 2) Nucleating agent to control crystallinity; 3) Raw material batch consistency control
Key Takeaway
Impact fluctuation is caused by unstable dispersed phase and crystallization; stable processing is key
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