Processing Machinery
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PA6 Residence Time Limit
Problem Phenomenon
Small parts produced on a large machine gradually yellow, performance fluctuates, and black specks increase over time
Cause Analysis
PA6 residence at 280°C must not exceed 4-5 minutes, and only 1-2 minutes at 310°C; a small shot volume in a large barrel causes the melt to be repeatedly heated, and degradation products are periodically released, forming black specks and yellowing
Solution
①Shot volume accounts for 40-80% of barrel capacity; ②switch small parts to a small machine or dedicated screw; ③purge the barrel and lower the temperature when downtime exceeds the limit; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
Residence time is the invisible red line of PA6 thermal management; the 40-80% shot proportion plus the time-limited shutdown procedure is the equipment-matching principle for preventing degradation; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence
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