Material Drying
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PA6 Density Porosity Troubleshooting
Problem Phenomenon
PA6 products are underweight and have insufficient strength, with micropores visible in the cross section
Cause Analysis
Shrinkage cavities at thick walls or gas in the melt form pores; insufficient raw '2079851475616104451 and insufficient holding pressure are the main causes, and pores reduce density and strength; during on-site troubleshooting, verify item by item according to this mechanism, avoiding blind machine adjustment based only on experience
Solution
Strengthen drying to eliminate water vapor pores; increase holding pressure and extend holding time to eliminate shrinkage cavities; enlarge the gate to ensure feeding compensation; check slices to confirm pore location and treat accordingly
Key Takeaway
Underweight density indicates internal pores, troubleshoot along the two lines of water vapor and shrinkage cavities; 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 similar problems in the future
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