Material Drying
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PA66 film packaging
Problem Phenomenon
PA66 film has many gel particles and uneven thickness, and heat seal strength fluctuates between batches
Cause Analysis
Insufficient pellet drying and degradation impurities form gel particles; uneven die head temperature causes thickness deviation; after the film absorbs moisture, the heat seal window drifts and strength fluctuates accordingly; during on-site troubleshooting, verify item by item according to this mechanism, avoiding blindly adjusting the machine based only on experience
Solution
①Dehumidify and dry before extrusion and filter the melt; ②Die head zone temperature control and regular die lip cleaning; ③Seal and store film rolls and control bag-making environment humidity; after adjustment, take continuous samples to verify the effect, confirm stability before resuming mass production
Key Takeaway
The PA66 film quality chain extends from drying to the bag-making environment; gel particles rely on drying and filtration, heat seal stability relies on humidity management; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence
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