Material Drying
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HDPE film misty water marks
Problem Phenomenon
Misty water mark traces appear on the film surface, and the transparency decreases locally.
Cause Analysis
The extrusion temperature is low and plasticization is insufficient, and the interface between unmelted particles and the melt scatters light; moisture content exceeding the standard due to damp resin also produces water marks.; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①Appropriately raise the extrusion temperature to improve plasticization; ②dry the raw material until the moisture content is within 0.3%; ③check the plasticizing capacity of the screw; ④stabilize the feeding.; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Misty water marks point to plasticization and moisture problems; attacking both temperature and drying can eliminate them.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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