Material Drying
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PET drying air volume calculation
Problem Phenomenon
After adding a large-capacity drying hopper, the drying effect instead deteriorates
Cause Analysis
The hopper is enlarged but the fan air volume is not matched, the dry air volume per unit of material is insufficient, and the dehydration efficiency decreases; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Calculate the air volume at 0.8-1.2 m³/h per kilogram of chips; select the fan and hopper as a matched set; verify the moisture content after modification; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Drying capacity is calculated by air volume, and one cannot just enlarge the hopper; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent similar problems
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