Molds & Tooling
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Incomplete crosslinking of EVA foaming
Problem Phenomenon
The product continues to shrink after demolding, and its performance does not meet the standard.
Cause Analysis
Insufficient decomposition of the crosslinking agent (residual amount >10%) results in insufficient crosslinking density; insufficient vulcanization temperature or time is the main cause.; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based on experience alone
Solution
①Raise the vulcanization temperature to 170~180°C; ②add accelerators such as magnesium oxide; ③extend the vulcanization time; ④test the crosslinking degree for verification.; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Crosslinking sufficiency determines the dimensional stability and performance of foamed products; the three elements of temperature, time, and accelerator work in synergy.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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