Material Drying
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PA6 Film Extrusion
Problem Phenomenon
PA6 film shows gel particles and uneven thickness, and bag-making heat seal strength is unstable
Cause Analysis
Insufficient pellet drying and degradation impurities form gel particles; uneven die temperature causes thickness deviation; after PA6 absorbs moisture, the heat seal window drifts and heat seal strength fluctuates; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①Dehumidifying drying before extrusion to moisture content ≤0.1%; ②melt filtration to remove gel particles and impurities; ③store film rolls sealed, and control storage humidity before bag making; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
The PA6 film quality chain extends from drying to storage; gel particles are dually controlled by filtration and drying, and heat seal stability is maintained by humidity management; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence
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