Material Drying
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PA6 Hot Air Circulation Uniformity
Problem Phenomenon
In the drying hopper, PA6 near the air inlet is over-dried and yellowed, while that far from the air inlet still contains moisture
Cause Analysis
The drying hot air is unevenly distributed in the hopper forming a short circuit; the material near the air path is over-heated and over-dehydrated, the material in the dead zone is under-dried, and the overall uniformity is poor; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Install a dispersing cone and air-equalizing plate in the hopper to improve air distribution; regularly clean the accumulated material at the air inlet; control the loading volume within 80% of the hopper capacity to leave air path space; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
Drying uniformity depends on the air path design, and both the dispersing device and a reasonable loading volume are indispensable; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence
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