Material Drying
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PET hopper heat preservation
Problem Phenomenon
In the drying hopper, the PET chips are dry on top and wet at the bottom, and product quality is unstable
Cause Analysis
Poor hopper heat preservation causes heat loss at the top and short-circuiting of the dry air, making the upper and lower layers of the material bed dried unevenly; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Fully insulate the hopper and check the air path distributor; do not fill beyond 80%; regularly clean the powder accumulated in dead corners of the hopper; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Hopper heat preservation and air path uniformity are the guarantee of drying consistency; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent similar problems
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