Processing Machinery
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EVA foaming hardness adjustment
Problem Phenomenon
The product hardness does not reach the target range.
Cause Analysis
Hardness is jointly determined by the foaming ratio, crosslinking degree, and formula; a single parameter adjustment is difficult to control precisely.; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based on experience alone
Solution
①Adjust the combination of foaming ratio and crosslinking degree; ②optimize the filler ratio; ③optimize by DOE according to the hardness target; ④test and verify.; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Hardness adjustment is a multi-factor optimization problem; systematic experiments are more efficient than single-item trial and error.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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