Material Drying
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PA6 Moisture Content Rapid Verification
Problem Phenomenon
Appearance cannot judge whether drying is qualified; waiting until defects appear on products to find out is too late
Cause Analysis
PA6 hydrolysis damage has already occurred when the appearance is still normal, and visual inspection and touch cannot judge the moisture content; only quantitative testing can intercept unqualified pellets before production; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①Use Karl Fischer titration to actually measure the moisture content as the release standard; ②the weight-loss method can be used for rapid screening on the production site but must be calibrated with Karl Fischer; ③the first material of each shift must be inspected
Key Takeaway
Moisture content testing is the first gate of PA6 quality; the Karl Fischer method is the benchmark and the weight-loss method is the on-site supplement, test first before production; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence
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